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	La conjecture de Goldbach		2011-02-18
		ahmedbenmoussa pose la question : montrez que tout nombre entier paire supérieur à 4 s'écrit somme de deux nombres premiers Claude Tardif lui répond.
	une écriture plus simple des expressions		2011-01-13
		jessie pose la question : trouver une écriture plus simple des expressions suivantes sachant que : x + y = 3 et x - y =-2 A=x-1+y+2             B=x-1+y-2 C=x+1+y+2            C=x+1+y-2 Claude Tardif lui répond.
	Quel est le 6e nombre dans la serie suivante		2010-08-13
		jeff pose la question : Quel est le 6e nombre dans la serie suivante: 1,2,6,42,1806,... Stephen La Rocque and Claude Tardif lui répond.
	Deux nombres consécutifs		2010-01-18
		Janot pose la question : Bonjour comment peut on faire pour démontrer que si deux nombres sont consécutifs, leur produit et leur somme sont premiers entre eux Merci de me mettre sur la voie , j'ai échoué avec Bezout. Claude Tardif lui répond.
	2^(2^1954) est-il premier?		2005-10-04
		Un eleve pose la question : 2(21945)+1 est-il premier? Claude Tardif lui répond.
	Nombre premier		2004-11-01
		Katia pose la question : Pouvez-vous me dire comment savoir si un nombre est premier? Claude Tardif lui répond.
	Nombre Premier		2003-02-24
		Un Etudiant pose la question : Montrer que si p est facteur premier de 22n + 1 alors (p-1) est multiple de 2n+2 Claude Tardif lui répond.
	preuve par 9		2001-04-04
		Michel pose la question : Pourriez-vous m'expliquer en détail comment fonctionne la preuve par 9 (pour une division et une multiplication). Je sais l'appliquer mais je ne sais pas pourquoi ça marche. Je ne retrouve pas la démonstration. Merci de m'aider. Exemple . 17x2=34 ; preuve par neuf : 1+7=8 ; 8x2= 16 ; 1+6=7 et 3+4=7, on peut donc supposer (sans affirmer) que cette multiplication a un résultat juste car la preuve par 9 est bonne, 7=7. Comment fonctionne cette preuve par 9??? Claude Tardif lui répond.
	400 in 7.5 billion		2019-08-28
		Emma pose la question : What is a better way to express 400 in 7.5 billion? My daughter has a rare condition, I want to know the answer to say “she is 1 in a ...” Penny Nom lui répond.
	The sum of three consecutive even integers		2019-01-27
		Pauleen pose la question : Translate this into algebraic expression The sum of three consecutive even integers, if x is the first even integer Penny Nom lui répond.
	Solve for x in Y=1.5x + log (1+x)		2018-12-23
		Asadollah pose la question : Please restate below expression in terms of y Y=1.5x + log (1+x) Thanks Penny Nom lui répond.
	Predicting the number of fish in a lake		2018-09-16
		April pose la question : A researcher catches 30 fish in a pond, attaches a marker to their fin and releases them. The next day she places a large net in the water and catches 9 fish. 3 have the marker attached to their fin. Can she predict the number of fish in the pond??? Thank you Penny Nom lui répond.
	Pre tax and post tax percentages		2018-05-22
		Tom pose la question : Hi, I work in a clothes shop which can also do mail-orders. My Head Office has sent a report with which we can check the records we keep in store tally with those at HO. According to that report we have taken £2578.25 in orders, excluding VAT (20%), which would therefore be £3093.91 including VAT (2578.25+20%=3093.91). According to my records, we have taken £3179.32 including VAT, which would be £2543.45 excluding VAT (3179.32-20%=2543.45). Why is it that the difference between the VAT inclusive figures (3179.32-3093.91) is +£85.41, but the difference between the VAT exclusive figures (2543.45-2578.26) is -£34.81? Now, I can see from the report that 1 order has not been recorded by HO, and I know that our average order value is around £30, so the -£34.81 makes sense. But surely both figures should be a minus, regardless of whether they include VAT? I'm sure there is an obvious answer, but I just cannot see it! Any help would be gratefully received. Thanks, Tom Penny Nom lui répond.
	Two expressions for the perimeter of a a rectangle		2018-05-13
		Slayde pose la question : A rectangular house has one side 4 metres longer than the other. Create two different expressions for its perimeter. The expressions should be given in factorised and expanded form. Penny Nom lui répond.
	Simplify 1/2^i		2018-01-28
		Deepak pose la question : How do I simplify this complex equation: z=1/(2^i) Penny Nom lui répond.
	y as an expression in terms of x		2018-01-20
		Mark pose la question : What is y as an expression in terms of x ? pennt lui répond.
	8^3/2(2+2)		2017-01-13
		Mary pose la question : 8^3/2(2+2) Penny Nom lui répond.
	The amount of material remaining on a roll		2016-11-11
		Yoh pose la question : Question from Yoh: Hello, I am trying to find impressions on a roll (either full roll or partial). Let's say I have the following information. - Outer Diameter of roll - Inner Diameter of roll (cardboard core) - thickness per layer - Each cut off length (impression length) Now let's say a roll has a 40in outer diameter, the cardboard core has a 3.75in diameter and a thickness of .002. Each impression has a cut off of 14inches. With this the roll will have approximately 2,700 impressions. How would I find the remaining impressions if the outer diameter of the roll is only 6.5inches? Thank you. Penny Nom lui répond.
	A mixed number as a percent		2016-10-18
		Jayda pose la question : how go you change a mixed number into a percent Ex. 3 3/4 Penny Nom lui répond.
	Compressed Earth blocks		2016-03-02
		John pose la question : how many 14"x10"x4" blocks do I need for a 1300sq foot house 8 foot high Penny Nom lui répond.
	The uniqueness of the lub		2015-10-25
		Aishwarya pose la question : Prove that if the lub and glb of a set exist then they are unique Penny Nom lui répond.
	Why is the area of square not conserved when it changes to a rhombus?		2015-06-28
		shubham pose la question : Why is the area of square not conserved when it changes to a rhombus, both have equal sides still rhombus have less area than square.?? Penny Nom lui répond.
	1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 x 0 + 1 = ?		2015-06-18
		Sharon pose la question : 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 x 0 + 1 = ? I got 1 as my answer despite BODMAS making it 12 because logic tells me I ought to place brackets around the first set of repeated addition. Could you please clarify this for me? Thank you 😊 Harley Weston lui répond.
	An angle of depression problem		2015-05-14
		haxir pose la question : find the height of the balloon directly above a town if the measure of angle of depression of another town 5km from the first town is 20°!6` Penny Nom lui répond.
	Angles of elevation and depression		2015-03-08
		Timmy pose la question : Joel is walking down a street and sees a 115 ft tall building in front of him. He stops 190 feet from the base of the building at the tip of the building's shadow. Round answers to three decimal places. A. If there was a piece of rope from the top of the building to Joel, how long would it be? B. What is the angle of elevation from Joel to the top of the building? C. Margaret says that she could find the angle of depression from the top of the building to Joel by subtracting the angle of elevation from 90°. Is she correct? Explain. Penny Nom lui répond.
	A man is standing on top of a building		2015-03-06
		kiki pose la question : a man of height 1.5m standing on top of a building of height 48.5m views another building across the square. he observe that the angle of depression of the bottom of the building is 40 degrees and the angle of depression of the top of the building is 5 degrees. Both buildings stand on the same level a) calculate the distance of the man from the base of the building across the square measured along the line of sight Penny Nom lui répond.
	3 over "x" plus 5		2015-02-23
		Kenny pose la question : 3 over "x" plus 5. I don't know this is either a polynomial and if so how would you define it. Harley Weston lui répond.
	128/(-16)/(-2)		2015-01-28
		jackie pose la question : 128/(-16)/(-2) I was wondering if you can show me how to work this question out Harley Weston lui répond.
	The height of a building		2015-01-20
		Emily pose la question : A man 2m high observes the angle of elevation to the top of the building to be 70 degrees. And the angle of depression to the bottom of the building to be 19 degrees. How tall is the building? Robert Dawson lui répond.
	What is 20 and 3/5 of 10?		2014-11-26
		Jeannine pose la question : What is 20 and 3/5 of 10? Question is written exactly this way. Is this 20 3/5 times 10 (103/5 times 10), or is it 20 and (3/5 times 10)? Penny Nom lui répond.
	Pre algebra		2014-10-12
		mohamed pose la question : i want to know the meaning of pre algebra Penny Nom lui répond.
	The angle of depression		2014-03-08
		Ranger_minor pose la question : A woman of height 1.4 metres standing on the top of a building 34.6 metres high views a tree some distance away. she observes that the angle of depression of the bottom of the tree is 35 degrees and the angle of depression of the top of the tree is 29 degrees. assume that the building and the tree are on level ground : 1). calculate the distance of the woman from the top of the tree measured along her line of sight. Penny Nom lui répond.
	Using trig to find the height of a hill		2013-08-14
		Anna pose la question : From the top of a hill, the angles of depression of two successive milestones on a level road, which leads straight away from the hill, are 5degrees and 15degrees respectively. Fine the height of the hill. Suggestion: BE is drawn perpendicular to AD. Find BE, then BD, finally CD. Thanks :) Penny Nom lui répond.
	Bags of pre-mixed concrete		2013-04-12
		Bruce pose la question : Hello there, I need two cubic yards of concrete for a playgound I am installing for my kids. That much i have figured out. I am stumped over the number of 25kg bags of pre-mixed concrete i will need to accomplish my goal. Your help would be greatly appreciated. Thanks Bruce Harley Weston lui répond.
	An algebraic exercise		2013-03-18
		autumn pose la question : given: f(x)=x/(x^2+2) determine: [f(x-h)-f(x)]/h Penny Nom lui répond.
	A messy arithmetic expression		2013-02-24
		niiaryee pose la question : (((((5^2*4^3)1/5+9^3/3)+(25+(4*5)/15)^2-10)/10/2)3))))) Penny Nom lui répond.
	The angles of elevation and depression		2012-12-03
		Chelsey pose la question : a person on a balcony of one building looks towards a second building. if the angle of elevation to the top of the second building is 25 degrees, the angle of depression to the bottom of the second building is 17 degrees, and the balcony of the first building is 22 feet above the ground, what is the height of the second building? Penny Nom lui répond.
	A mathematical expression with the answer 7		2012-11-10
		emily pose la question : hey um i need to find and problem that fallows bedmas that has one division one multiplication and one sub and one add and one brackets and one exponents that has the answer of number 7 Penny Nom lui répond.
	Forming an algebraic expression		2012-10-27
		ashley pose la question : A sidewalk has a constant width W and comprises several short sections having lengths 12, 14,and 10 feet. How do I find the simplified expression that gives the number of square feet of sidewalk? Penny Nom lui répond.
	Find an algebraic expression		2012-10-03
		Karen pose la question : Question from Karen, a parent: Find an algebraic expression relating the input and output. input output     3 1 9 3 15 5 21 7 27 9 Penny Nom lui répond.
	The spread of a rumor		2012-04-09
		Roohi pose la question : The function f(t) = a/(1+3e^(-bt)) has also been used to model the spread of a rumor. Suppose that a= 70 and b=3 0.2. Compute f(2), the percentage of the population that has heard the rumor after 2 hours. Compute f'(2) and describe what it represents. Compute lim t approaches infinity and describe what it represents. Penny Nom lui répond.
	An arithmetic expression		2011-11-28
		Muhmmad pose la question : 2/5*-3/7-1/6*3/2+1/14*2/5 Penny Nom lui répond.
	The value after 30 years		2010-12-15
		Abeth pose la question : At the end of every year, the owners of a building which costs 2, 500, 000 pesos deducts 15% from its carrying value as estimated at the beginning of the year. find the estimated value at the end of 30 years. Penny Nom lui répond.
	How many cubic metres of water can safely be stored in the tank?		2010-09-10
		susanna pose la question : This water tank is a perfect sphere with an inner radius of 12 metres. However, they used inferior materials to build the water tank, and the tank can only withstand a water pressure of 185 kiloPascals. Assume the density of water is exactly 1000 kg/m3, gravity is 9.8 metres/s2, and disregard atmospheric pressure. How many cubic metres of water can safely be stored in the tank? Round DOWN to the nearest whole number (since rounding up could be catastrophic in this instance!), and please submit only a number with no other information. Robert Dawson lui répond.
	Four less than three times a number is 14		2010-04-16
		David pose la question : My daughter has two questions that we could use some help with. First ? Four less than three times a number is 14 Secound? The quotient of -15 and w Penny Nom lui répond.
	Metric prefixes		2010-03-16
		ali pose la question : How do you convert zectometres to yoctometres Robert Dawson lui répond.
	Eye Height Level Found from Visual Angle		2009-08-07
		Jolie pose la question : Hello, I am trying to figure out what height from the ground a person's eyes are if they have a 12 degree visual angle to a screen that is 58cm away from their eyes? Thank you. Janice Cotcher lui répond.
	Pre-Algebra Resources		2009-07-16
		M pose la question : What is the best pre algebra book that is inexpensive and will really help me to understand pre algebra? Janice Cotcher lui répond.
	x^3+1/x^3=18*sqrt(3)		2009-07-08
		Nazrul pose la question : If x^3+1/x^3=18*sqrt(3) then how can I evaluate the value of x+1/x? Thank you for your help. Robert Dawson lui répond.
	Finding Force When Pressure and Area Are Known		2009-06-25
		chris pose la question : i need to calculate the force for a tube. given the follwing data. pressure is 900 PSI Tube is 6 m long by 1.5m Outside Diameter Janice Cotcher lui répond.
	Pressure at Given Depth		2009-02-22
		Tamara pose la question : A sea is 3km deep. The average density of sea water there is 1020 kg/m^3. What is the water pressure at the bottom? Janice Cotcher lui répond.
	Angle of depression		2009-02-18
		Meeka pose la question : An aircraft flying at an altitude of 2000m is approaching an airport. If the angle of depression of the airport is 5 degrees, what is the distance from the plane to the airport measured along the ground? Round your answer to the nearest tenth of a kilometer. Robert Dawson lui répond.
	The whole number that precedes a number w+3		2009-01-17
		Morgan pose la question : write a variable expression for "The whole number that precedes a number w+3" Penny Nom lui répond.
	An expression for q quarters and n nickles		2009-01-16
		Morgan pose la question : a variable expression for: "The value in cents of q quarters and n nickels" Penny Nom lui répond.
	Algebraic fractions		2008-10-06
		Kayla pose la question : (x^2-9)/x times (x^3-4x)/(x^2+5x+6) Harley Weston lui répond.
	A security camera		2008-09-07
		Rita pose la question : A security camera in a neighborhhod carnival is mounted on a wall 9 feet above the floor inside a video gallery. What angle of depression should be used if the camera is to be directed to a spot 6 feet above the floor and 12 feet from the wall? Stephen La Rocque and Harley Weston lui répond.
	An algebraic expression		2008-08-29
		Antonio pose la question : write a variable expression for 9 less than k Penny Nom lui répond.
	The square root of a fraction		2008-08-24
		Lauren pose la question : How do you solve square roots of fractions? Does the format change if it is either a proper or an improper fraction? Ex. the square root of 1/4 or the square roots of 80/25 Penny Nom lui répond.
	How many decimeters are in a meter?		2008-08-11
		Julia pose la question : How many decimeters are in a meter? Penny Nom lui répond.
	Express as a function of x		2008-07-14
		Rita pose la question : Express the area A of an isosceles right triangle as a function of x of one of the two equal sides. NOTE: I always see the phrase "Express as a function of x" in math textbooks. What exactly does that phrase mean? I also have seen it written as "Express in terms of x." Penny Nom lui répond.
	1/3-5/6=1/x, solve for x		2008-05-01
		Lavada pose la question : 1/3-5/6=1/x How do I solve this problem. Penny Nom lui répond.
	Simplify 5x^5/8 / 15x^2/12		2008-04-18
		Kyler pose la question : 5x^5/8 / 15x^2/12 Divide the rational expressions. Simplify the results. Penny Nom lui répond.
	How would I graph: x - 2 divided by x^2 - 4?		2008-03-19
		Sean pose la question : How would I graph: x - 2 divided by x^2 - 4 using a method in extreme values of functions or completing the square x - 2/ x^2-4 Stephen La Rocque lui répond.
	An arithmetic expression		2008-03-05
		Kasani pose la question : evaluate the expression: -2^-1[-14 - 4(-6)] - (7 - 3) Penny Nom lui répond.
	How do I convert mcg to ml?		2008-01-27
		David pose la question : How do I convert mcg to ml? Stephen La Rocque lui répond.
	Simplifying square roots		2007-12-19
		Ciara pose la question : How would you calculate 2 to the square root of 8 plus 4 to the square root of 2 minus 5 to the square root of 2? Stephen La Rocque lui répond.
	Imprecise measurements		2007-12-09
		Sara pose la question : Hi! A water tank, in the shape of a cuboid (length 1.6 m, height 1.2 m, breadth 0.8 m), is full of water. Water is drained from the tank at a rate of 8 litres per minute. The dimensions of the tank are given to the nearest 10 cm. The rate at which the water is drained from the tank is given to the nearest 0.5 litres per minute. (a) Calculate the smallest possible time to drain the tank. (b) Calculate the greatest possible time to drain the tank. Many thanks!!! Stephen La Rocque lui répond.
	Order of operations		2007-10-17
		Devon pose la question : What function precedes the other? ie; 18 - 4 x2 = Penny Nom lui répond.
	Subtracting rational expressions		2007-10-09
		Pamela pose la question : Subtract: 6p – w __ 4c + p w – 4 w – 4 Stephen La Rocque lui répond.
	Variable expressions - part 2		2007-09-04
		lisa pose la question : how do I write a variable expression for word phrase example x less than = 2 or 2 less than p 4 fewer than job please help Penny Nom lui répond.
	Variable expressions		2007-09-04
		Eric pose la question : how so i write a numerical or variable expression for each quantity. example two dozen eggs or d dozen eggs number of quarts ub a 3 gallons Penny Nom lui répond.
	The quotient of thirty and ten times a number.		2007-09-02
		Jenna pose la question : I need help on How to translate a phrase into an algebraic expression: The quotient of thirty and ten times a number. Penny Nom lui répond.
	george, thomas, abe, alexander...		2007-09-01
		lori pose la question : george, thomas, abe, alexander... come up with the next few im confused and need help!! Stephen la Rocque and Harley Weston lui répond.
	Angle of depression to a football		2007-08-15
		Tosin pose la question : The angle of depression to a football from the top of building 10m high is 17 degrees. Find the distance of the ball from the foot of the building. Stephen La Rocque lui répond.
	Angle of depression		2007-07-23
		joyce pose la question : hello, here is my problem...... As you stand on a bridge w/c is 100 ft. above the water you are looking @ an approaching barge. If the A of top of the front of the bridge is 29.04 degrees and the angle of depression of the rear is 17.36 degrees . Find the length of the barge? Harley Weston lui répond.
	Angle of depression (declination) between sailboat observations		2007-07-18
		Joyce pose la question : From a cliff 150 ft above a lake, we see a boat sailing directly towards us. The angle of depression of the boat is seen to be 5 degrees and 7 inches and 11 degrees and 18 inches. Find the distance sailed between observations. Stephen La Rocque lui répond.
	The two towers (angles of elevation trigonometry)		2007-07-14
		joyce pose la question : The angle of elevation of tower B from the top of tower A is 28 degrees and the angle of elevation of the top of tower A from the base is 46 degrees Find the height of tower A if tower B is 120 m high? Stephen La Rocque lui répond.
	Simplifying a quartic rational expression using long division		2007-06-14
		Megan pose la question : x+2/12x^4+17x^3+0x^2+8x-40= Stephen La Rocque and Penny Nom lui répond.
	Angles of depression		2007-06-13
		Phonda pose la question : The pilot of a small private plane can look forward and see the control tower for a small airstrip. Beyond that is a large factory that is 3 milies from the airstrip. The angles of depression are 12.5 degrees and 4.8 degrees respectively. Find the airplane's altitude, to the nearest ten feet. Stephen La Rocque lui répond.
	Express a certain variable as a function of another variable		2007-06-12
		Gilligan pose la question : The volume V of a right circular cone is V = (1/3)pi(r^2)(h). If the height is TWICE the radius, express the volume V as a function of r. I see the phrase "express a certain variable as a function of another variable" a lot in math books. What exactly does that mean? Is there another way to say the same thing? Stephen La Rocque lui répond.
	Rational polynomial expressions		2007-06-09
		a student pose la question : I have a question that continues to lead me to the answer x/(x - 1) but according to my math book, the answer should be 1/(x - 1). Who is right? Who is wrong? Here is the question: (x^2 - 6x - 27)/(x^2 - 11x + 18) DIVIDED by (x^3 + 2x^2 - 3x)/(x^2 - 2x) Stephen La Rocque lui répond.
	A pipe full of water		2007-06-07
		paul pose la question : What is the volume of water in a 100mm inside diameter pipe that is 12.5 meters long What would be the pressure at the bottom if the pipe was installed in the vertical plain Steve La Rocque, Penny Nom and Gabriel Potter lui répond.
	A machine depreciates by 20% each year		2007-06-03
		katie pose la question : the value of a machine depreciates by 20% each year. How would i find what single decimal number to multiple the original value by to find its value after 2 years? Penny Nom lui répond.
	Angle of Elevation		2007-05-10
		Micky pose la question : Two Buildings are on opposite sides of a street 40 feet wide. The taller of the two buildings is 580 feet tall. The angle of depression from the top of the tallest building to the shorter building across the street is 57 degrees. Find the height of the shorter building. Stephen La Rocque lui répond.
	Pre-algebra volume of a prism		2007-05-10
		Brenda pose la question : Find the volume of a triangular prism with a base of 5 cm by 5 cm and a height of 12.5 cm. Round to the nearest tenth. Stephen La Rocque lui répond.
	Converting from mm to cm		2007-05-08
		Amanda pose la question : How do you convert mm into centimeters? Gabriel Potter and Steve La Rocque lui répond.
	Simplifying a rational expression		2007-04-29
		Tamika pose la question : X^2 + 10X + 24 ______________ X + 6 SIMPLIFY EACH RATIONAL EXPRESSION (IF YOU CAN'T SIMPLIFY IT, WRITE ALREADY SIMPLIFIED) Stephen La Rocque lui répond.
	The angle of depression		2007-04-14
		Mary-Beth pose la question : Two towers are 30 m apart. From the 15th floor, 40 m up, find the angle of depression to the base of the taller tower? I think the answer is 53, but the answer book says 37. Penny Nom lui répond.
	Adding and Subtracting Rational Expressions		2007-03-21
		Pricilla pose la question : Pricilla I do not know how to do this problem. Don't know where to start. [(5)/(2x-8)]+[(3x^2+15)/(x^3-4x^2+5x-20)] Stephen La Rocque lui répond.
	Angles of depression		2007-03-21
		romaine pose la question : a woman of height 1.4m standing on top of a building of height 34.6m veiws a tree some distance away. she observes that the angle of depression of the bottom of the tree is 35 degrees, and the angle of depression of the top of the tree is 29 degrees. assume that the building and the tree is on level ground. (a) calculate the distance of the woman from the top of the tree measured along her line of sight. (b) determine the height of the tree. Stephen La Rocque lui répond.
	Simplifying exprressions		2006-11-06
		Jessica pose la question : -21(a+2b)+14a-9b Stephen La Rocque lui répond.
	The real numbers with decimal representations consisting of all 1s.		2006-10-29
		Ivessa pose la question : Determine if the following set is countable or uncountable : the real numbers with decimal representations consisting of all 1s. Steve La Rocque and Walter Whiteley lui répond.
	How do you write a variable expression		2006-10-11
		Josh pose la question : How do you write a variable expression for the following: The amount of money Waldo has if he has $10 more than Joe and How much weight Kirk can lift if he lifts 30 lbs more than his brother. Stephen La Rocque lui répond.
	Metric Conversions		2006-09-02
		Patricia pose la question : I have a new difficulty, metric conversion when it involves the prefixes. Some problems I need help with are: Stephen La Rocque lui répond.
	My wife's recent pregnancy,		2006-07-24
		Tom pose la question : During my wife's recent pregnancy, it so happened that my wife's 29th birthday fell on the exact same day that her unborn child was 29 weeks old (i.e. it was 29 x 7 days from the date of conception as advised by the doctor) I would like to know what the probability is of the above event occurring for a randomly chosen pregnant woman i.e. that the pregnant mum's x'th birthday falls on the same day that the unborn child is x weeks old EXACTLY. Stephen La Rocque lui répond.
	Simplify the variable expression: 3g^2h over 12gh		2006-02-09
		Andrew pose la question : okay the question says simplify the variable expression: 3g2h over 12gh how would u do this? Penny Nom lui répond.
	preuve par neuf		2006-02-08
		Thonet pose la question : Je suis enseignante en primaire en Belgique et j'aii actuellement une stagiaire étudiante qui va devoir apprendre à mes élèves comment fonctionne la preuve par 9. Elle sait expliciter concrètement celle-ci et a trouvé l'explication du pourquoi de sa fonction mais nous ne savons pas l'origine de cette application mathématique... Qui l'a inventée ? Pourquoi ? ... Pourriez-vous nous éclairer ? Claude Tardif lui répond.
	Rational expressions		2005-11-15
		Zach pose la question : I can solve easy problems such as (x/2)+3=2+(3x/4). That is easy because the Lowest Common Denominator is 4. But what really gets me stuck is a problem like this one. (6/x-2) = ( 21/(x-2)(x+2) )+ 1. Penny Nom lui répond.
	Coefficients, constants and like terms		2005-10-05
		Elizabeth pose la question : In the equation -8y+6ab+7-3ab what are the coefficients; the like terms and constants? Penny lui répond.
	2x/x^2-9 - 6/x^2+x-12		2005-09-27
		Emily Ann pose la question : 2x/x2-9 - 6/x2+x-12 Penny Nom lui répond.
	A rational arithmetic expression		2005-09-14
		Vijay pose la question : How to simplify following Grade 9 math problem: (4/-9) X (-21/-32) X (-3/14) Penny Nom lui répond.
	Rational expressions		2004-09-24
		A student pose la question : In general, I understand rational expressions except when it comes to solving problems such as: x+y/2x-y - 2x/y-2x or m-4/3m-4 + 3m+2/4-3m I am confounded by the issue of having to find a common denominator. For example, if I tried to solve these problems by multiplying both denominators they would still be uncommon. Claude Tardif lui répond.
	An equation with rational terms		2004-06-17
		Louise pose la question : simplify the expression (a2+n2)/2n = a2 + (a2-n2)/2n Penny Nom lui répond.
	Angles of elevation and depression		2004-05-18
		Anjum pose la question : what is the difference between an angle of elevation and angle of depression? Penny Nom lui répond.
	Rational expressions		2004-04-06
		Shivani pose la question : I am in 11th grade Honors Algebra II. We are currently learning about adding and subtracting rational expressions. I looked at the other questions that were similar to that of mine, but they weren't quite answering my question. I have been working on many problems to practice and see if I can come up with the correct answer, but I can't, I got like 2 out of every 7 right on my school homework. I get the easy ones, where when you have to find the LCD, it's just the other denominator. But, on others you have to really think about it. Those are hard. Here are some of the problems that I cannot get at all: (x2 - 3x + 1)/(x2 - 4) - (x2 + 2x +4)/(2 - x) - (x - 4) /(x - 2) The correct answer is: (x3 + 4x2 + 7x + 17)/(x2 - 4) Penny Nom lui répond.
	A metric prefix table		2004-03-07
		April pose la question : Can you tell me what the scale is for nano, micro, mega, kilo, etc.... I know that mega is 10 to the sixth power but I can't remember the other ones. Penny Nom lui répond.
	Rearranging an expression		2004-02-24
		Corey pose la question : use the following formula to answer the question F=9c divided by 5 plus 32 rearange the formula to solve for c how many degrees fahrenheit would it be it it was: 0 degrees celcius -10 degrees celcius -46 degrees celcius Penny Nom lui répond.
	Some trig problems		2004-01-18
		Weisu pose la question : I have some questions about pre-calculus. (1) (2(cos(x))^2)+3sin(x)-1=0 (2) sin(x)cos(x)=(1/2) (3) 3sin(x)=1+cos(2x) (4) tan(x)*csc(x)=csc(x)+1 (5) sin(arccsc(8/5)) (6) tan(arcsin(24/25)) (7) arccos(cos(11pi/6)) the last problem uses radian measure. Penny Nom lui répond.
	Prescription drug coverage		2003-12-04
		Khadijah pose la question : Last week congressional approval was given to legislation involving prescription drug coverage for seniors. One summary of the legislation explains that it is estimated that in 2006 a senior will pay a premium of $35 per month, then pay their first $250 in pharmacy bills. After the bills reach $250, the coverage would pick up 75% of their bills that bring their total bills between the $250 and $2250 mark. After their bills reached a total of $2250, the senior would be responsible for all bills bringing their total annual bills between $2250 to $5100. Then any bills after the $5100 mark has been reached will be 95% covered by the insurance. Using this information, letís analyze the situation of a senior who accumulates $6000 in pharmacy bills over one year and has the insurance coverage. Over the course of this year, how many dollars will the senior pay? Penny Nom lui répond.
	root24 = 2 root6		2003-11-13
		Burke pose la question : I know that all algerbra can be represented visually, for example: Y=9x+3 is a line on a two dimentional plane. Could Math Central please send me a visual representation of the proccess of simplifying square root like root24 equals 2root6 Penny Nom lui répond.
	Two precalculus problems		2003-08-04
		Kate pose la question : Please help me verify the identity: cos2x(sec2x-1)=sin2x Also I am having trouble withdetermining whether f(x) is odd, even, or neither f(x)=x3-x Penny Nom lui répond.
	Contradiction in the Procedural Precedence and the Distributive property		2003-07-03
		Arthur pose la question : When complicated expressions exist on both sides of a fraction, and both these expressions contain like and unlike terms with "literal" coefficients, the procedural precedence suddenly gets extremely confusing and seems impossible to simplify. This seems confusing and impossible to simplify because there is a HUGE contradiction in the way Procedural Precedence and the Distributive property deal with Parentheses. The Procedure says you MUST deal with what's INSIDE the parenthesis FIRST, BEFORE dealing with ANYTHING on the outside where as the Distributive property contradicts that by saying to go ahead and ignore the Precedence and use a factor on the outside of the Parenthesis. Claude Tardif lui répond.
	Subtracting rational expressions		2003-05-10
		Simone pose la question : hi, i'm totally lost. i understand that you need to find a lowest common denominator to subtract two fractions (rational expressions) with different denominators. but what if the denominators are "x-1" and "x". is x the common denominator? if so what happens to the "-1"? do you know of any live online help i can get with the following: 3/(x-1) - (1-2x)/x i've looked through my notes and have no examples that quite match that i can follow to get through it. please help! Penny Nom lui répond.
	Excluded values		2003-02-22
		Josh pose la question : Why do you think it is necessary to include the "excluded values" when you write your answers to rational expressions? Penny Nom lui répond.
	Rational expressions		2003-01-22
		A student pose la question : // = the main fraction line 1.) a+1/a-1 + a-1/a+1 // a+1/a-1 - a-1/a+1 2.) 2/a(squared)-3a+2 + 2/a(squared)-a-2 // 2/a(squared)-1 + 2/ a(squared)+4a+3 Penny Nom lui répond.
	Clown has eight steps to climb		2002-11-05
		A mom pose la question : I'm a parent of a grade two student. What is the best way to help my son figure out a math comprehension problem? Clown has eight steps to climb, is shown in a picture with front foot on third step and behind foot on first step. Each time he climbs three steps, he falls back two. How many times did he have to climb up to reach the top. Should I get him to do a line graph or math equations. On his own he came up with the answer seven. I think the answer is six. I did 0+3=3, 3-2=1, 1+3=4 and so on, In think my why is alittle confusing to him. Is there a simplier why to explain it to him. Diane Hanson lui répond.
	Simplifying Variable Expressions		2002-10-28
		Erika pose la question : i would like to ask you a mathematical question on Simplifying Variable Expressions. The question is 2(n-4)+3. Penny Nom lui répond.
	Nixon, Jefferson, and Madison		2002-10-08
		Lisa pose la question : The longest-lived US presidents are John Adams(age90), Herbert Hoover (also90), and Harry Truman (88). Behind them are James Madison, Thomas Jefferson, and Richard Nixon. The lattter three men lived a total of 249 years, and their ages at the time of death form consecutive odd integers. For how long did Nixon, Jefferson, and Madison live? Penny Nom lui répond.
	Rational expressions		2002-10-03
		Ashley pose la question : 1/x(squared) + 5/xy Penny Nom lui répond.
	Variable expressions		2002-08-15
		Brittany pose la question : I am just learning variable expressions. My homework is to write a variable expression for each word phrase; example : the number of minutes in s seconds the cost of x cartons of juice at $.75 each And etc. I don't understand it Penny Nom lui répond.
	Simplify this expression		2002-02-26
		Francine pose la question : 2X power 5 Y power 3 times 18 X power -5 Y power -3 divided by X power 1/3 Y power 1/4. I came up with 36 ---------- X 1/3 Y 1/4 The book says 36 x1/3 y1/4. I don't get it. Penny Nom lui répond.
	Simplifying algebraic expressions		2001-05-12
		A student pose la question : How do you simplify algebra expressions? Penny Nom lui répond.
	Adding and subtracting rational expressions		2001-05-03
		Donna pose la question : Adding and subtracting Rational expressions. I am in grade 10 and I am a student here is an example of the questions: 1/(x+1) - 1/(x-1) = ? Penny Nom lui répond.
	Compression by a factor of ?		2001-01-12
		Wayne pose la question : Given an equation like y = (1/2) (x-3)2 + 6, when describing the distortion from the base curve y = x2 is it correct to say there is a vertical compression by a factor of 2, or by a factor of 1/2 ? Which is more correct? I have seen both versions in different high school texts, and I am now unsure which is more correct. Harley Weston lui répond.
	Some trigonometry		2000-08-11
		Angela pose la question : I have some PreCal questions. I am a student at the secondary level. I would be very grateful for your help. Solve the equation for theta (0 <= theta < 2pi). tan2(theta) = 3 I know sec2(theta) -1 = tan2(theta) . . . Harley Weston lui répond.
	Eligibility in a contest		2000-03-14
		Ken Rabley pose la question : Hi, hoping you can help. Dispute among co-workers. Tell me, what is the correct answer to the following question: -1936 + (2406/4812) x (4756 - 3256) + 1250 Seems this is the question for eligibility in a contest...We have come up with various solutions, all which may be correct. Penny Nom lui répond.
	(-5)^2, -5^2 and -(5)^2		1999-10-13
		Jennifer Brown pose la question : What is the difference between the following problems: (-5)2, -52 and -(5)2 Our text book (Beginning Algebra, fourth edition, published by McGraw Hill, by Streeter, Huthison and Hoetzle) says the second and third problem are exactly the same. I don't see how that can be. Is there a mathematical rule that explains this? Penny Nom lui répond.
	Predictions		1999-09-22
		Joesph Dana pose la question : How do u find the results of an unbiased sample of 100 students that are shown on the table. For example the school has a total of 1,150 students prdict how many students would chose cereal(46) pancakes(15) eggs(20) and sandwich(19) Haeley Weston lui répond.
	Even and Odd Function		1999-06-17
		Kent pose la question : There is one function with the domain of all real numbers that is both even and odd. Please give me the answer to this question before I go insane. Penny Nom lui répond.
	Shape-preserving transformations		1999-05-04
		J McAndrew pose la question : A shape preserves its shape if a rotation, translation or scaling is performed on it. Are these the only continuous transformations which have this property? These transformations if performed on the parts and then summed have the same effect as the transformation being applied to the whole; are these linear transformations? Who, and what area of mathematics has classified all transformations of this type completely? Chris Fisher lui répond.
	A Presidential Proof		1997-03-18
		Greg Smith pose la question : Which US president developed a proof for the Pythagorean Theorem? Where can a copy of the proof be located? Chris Fisher and Harley Weston lui répond.
	Equivalent Expressions		1997-02-26
		Karyn Jones pose la question : Josie says that s=n/(n+1) and s/(1-s)=n are two ways to write the same formula. Describe whether or not you agree with Joise. Explain how you made your decision. Walter Whiteley and Penny Nom lui répond.

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