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61 articles trouvés pour ce sujet.

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	Fractions and negative powers		2019-09-22
		Will pose la question : -2/3 to the -6 power Penny Nom lui répond.
	A negative minus a negative		2019-09-03
		Maggie pose la question : Why is a negative minus a negative a negative? Penny Nom lui répond.
	A puzzling equation		2018-12-04
		Manny pose la question : Hello, Can you explain why this is wrong: -1 = (-1)^3 = (-1)^{6/2} = ((-1)^6)^{1/2} = (1)^{1/2} = 1 ?? Thank you Penny Nom lui répond.
	Adding two negatives		2018-02-04
		Pinasshakoane pose la question : (-23)+(-3) Penny Nom lui répond.
	Positive and negative values of a function		2018-01-30
		Grayson pose la question : f(x)=x^6-x^4 Interval: ( negative infinity, negative one ) Test Value: negative two Function Value f(x): positive forty eight Interval: ( negative one, zero ) Test Value: negative one Function Value f(x): zero Interval: ( zero, positive one ) Test Value: positive one Function Value f(x): zero Interval: ( positive one, positive infinity ) Test Value: positive two Function Value f(x): positive forty eight What is the sign of f(x) for each Interval? Penny Nom lui répond.
	A fraction with a negative exponent in the denominator		2015-04-30
		ellen pose la question : 7/ab to the -4 power Penny Nom lui répond.
	What is -3 squared?		2014-11-12
		Christine pose la question : On a math test, it said "What is -3 squared?" It did NOT say "What's is (-3)squared" The teacher's explanation is that if there are no brackets or parenthesis, you ALWAYS square the number first then do the negative, so the answer should be -9, but I can't find anywhere that confirms this. Help please. Robert Dawson lui répond.
	Changing the sign of an inequality		2012-09-19
		Bryauna pose la question : Why do you change the signs in inequalities?! Penny Nom lui répond.
	Exponential form		2012-09-04
		angie pose la question : How do i write 9^-5 in exponential form? Penny Nom lui répond.
	Exponential form		2012-01-15
		Helen pose la question : How do you write (1/x) in exponential form? Penny Nom lui répond.
	(27^r^-1)^-2/3		2011-04-24
		Yung-Ju pose la question : (27^r^-1)^-2/3 Penny Nom lui répond.
	A Squared Number That's Negative		2010-09-22
		David pose la question : What is the only number that when it's squared becomes negative? Stephen La Rocque lui répond.
	What is -2^2?		2010-08-25
		alex pose la question : I know that (-2)^2 is 4 but what is -2^2? Robert Dawson and Penny Nom lui répond.
	A negative times a negative		2010-03-25
		priya pose la question : why is minus into minus plus? Harley Weston lui répond.
	The test for some disease is 99% accurate		2010-02-24
		baaba pose la question : Assume that the test for some disease is 99% accurate. If somebody tests positive for that disease, is there a 99% chance that they have the disease? Chris Fisher lui répond.
	Percentage increase from a negative to a positive		2010-01-12
		Greg pose la question : If a company had a net lost in 2005 of $11,234 and net income of $3231 in 2006, what is the percentage annual growth in income between the two years? Robert Dawson lui répond.
	The intervals where the function is positive and negative		2010-01-10
		Ron pose la question : Hello I'm trying to find out the intervals where the function is positive and negative. It's for a polynomial function y= -(x+2)^2 (x-2) and y= (x+1)(x+4)(x-3) I have tried the right and left side of each x-intercepts, but I still don't understand the results thank you for your help Penny Nom lui répond.
	A number base that's not a positive integer		2009-12-11
		Nick pose la question : Is it possible for a number to have a base that's not a positive integer? Base 1 gives a result that's meaningless but possible. I have no concept of a base 0, a negative base, or a fractional base, never mind any other base. I think there isn't any base that's not a positive integer, but, knowing that math keeps jumping ahead and sometimes has inventions before anyone knows how to exploit them, I think I'd better ask. Thank you. Nick Robert Dawson and Claude Tardif lui répond.
	The maximum number of right angles in a polygon		2009-10-05
		Bruce pose la question : Is there way other than by trial and error drawing to determine the maximum number of right angles in a polygon? Secondary question would be maximum number of right angles in a CONVEX polygon. Is there a mathematical way to look at this for both convex and concave polygons? Or are we limited to trial and error drawing? Chris Fisher lui répond.
	Percent increase from a negative number to a positive number		2009-04-21
		Brian pose la question : I have no problem calculating year over year net profits but am having trouble when it comes to a negative. 2007 Net Profit = -110,333.00 2008 Net Profit = 66,054.00 Brian Harley Weston lui répond.
	Comparing positive and negative fractions		2009-03-24
		Christyrose pose la question : Hello. I am a sixth grade math student and i need help on how to compare negative and positive fractions. Here is is: 3/4 -2/3 7/10 -5/6 I'm not sure how to do the negative parts because i was absent for a couple days. Thank you! Christyrose Penny Nom lui répond.
	A fraction with negative exponents		2009-02-14
		Gabriel pose la question : What does the line seperating the top from the bottom mean? what does it tell you to do and what is the answer to the question? Question 3 Simplify. Write the answer using only positive exponents. Assume all variables represent nonzero numbers. (x^-5)^-4(x^-1y)^3 ________________ (xy^4)^3 Penny Nom lui répond.
	Multiplying negative numbers		2009-01-15
		stephanie pose la question : hi, I'm currently working in a grade 8 class where the students are learning about integers. the students were asked to find examples of how integers are applied in real life. they were able to find aplications for: adding and subtracting both positive and negative integers. however, we could not find an example of where two negative integers would be either divided or multiplied together in real life. For example: (-2)(-4)= +8. please help. Harley Weston lui répond.
	Negative rate of change		2009-01-12
		hemanshu pose la question : when i have to find rate of change of decrease in any value my ans comes in negative why?????????? Penny Nom lui répond.
	A product of positive and negative numbers		2008-10-03
		kaylou pose la question : Suppose you were given 13 numbers and asked to find their product. Seven of the numbers were positive, and the rest were negative. Would your product be positive or negative? Why? Penny Nom lui répond.
	Negative Exponents		2008-01-29
		Bill pose la question : t to the negative fourth power inside parenthesis to the ninth power OVER t to the negative fourth power inside parenthesis to the third power I am confused on how to start the problem. What I did was invert the Ts to make them positive and I then multiplied the powers. I am not sure if this is the correct process. Harley Weston lui répond.
	x^3 y^(-6)		2008-01-24
		Bill pose la question : I need help completing this negative exponents problem: x to the power of 3 multiplied by y to the power of negative 6. What would the process to solving this problem be? Penny Nom lui répond.
	Negative numbers		2007-12-14
		mannal pose la question : what negative integers do we use in the real world? like -30 temperature? Penny Nom lui répond.
	Multiplying an inequality by a negative number		2007-11-27
		Lisa pose la question : Why is it that you have to switch the sign of the inequality when you divide or multiply by an negative number to solve for a variable? Penny Nom and Walter Whiteley lui répond.
	Multiplcation of two negative numbers		2007-07-26
		Brett pose la question : Someone asked a question about multiplication and division of two negative numbers yielding a positive result here: http://mathcentral.uregina.ca/qq/database/QQ.09.99/butler1.html I was not fully happy with the explanation b/c I want to give me daughter a real-world example and I can't seem to find one. The following illustrates why multiplying negative numbers has become difficult to explain: 2 X 2 = 4 ----(-4)---(-2)---0---2---4 In this example we start with 2 and then want 2 more of them. When we move across the number line from 2 to our answer, which is four, we have moved only 2 units to the right. -2 X -2 = 4 ----(-4)---(-2)---0---2---4 In this example we start with -2 and then want -2 more of them. When we move across the number line from -2 to our answer, which is four, we have moved 6 units to the right. How can the phenomenon of multiplying two negative numbers being more powerful than multiplying two positive numbers be explained? -Brett Stephen La Rocque and Harley Weston lui répond.
	Proving a quadrilateral is a rectangle		2007-07-14
		Sonja pose la question : I was having this discussion with another teacher and we need a third opinion. When you are trying to prove a quadrilateral is a rectangle which method should you use: Prove the shape is a parallelogram by doing slope 4 times by stating that parallel lines have equal slopes. Then proving a right angle by stating that perpendicular lines have negative reciprocal slopes. Doing the slope 4 times and stating that the shape is a rectangle because opposite sides are parallel because of equal slopes and it contains a right angle because of negative reciprocal slopes. I guess the real question is do you have to first state that the shape is a parallelogram? Stephen La Rocque lui répond.
	Limits as x approaches a constant		2007-06-25
		Mac pose la question : can you please tell me what is the reason they say "denominator is a negative quantity" in the solution 11 and "denominator is a positive quantity" solution 10 ?? If i guess correctly, for solution 10, its because of x^2 in the denominator. Penny Nom lui répond.
	A subtraction problem with negative numbers		2007-04-12
		Bridget pose la question : my daughter has to change a subtraction problem with negative numbers in it to an addition problem with negative numbers and then solve the problem such as: -4-(-2)=? Penny Nom lui répond.
	What is the difference between -(3) and (-3)?		2007-02-11
		Mckaylla pose la question : What is the difference between -(3) and (-3)? Melanie Tyrer lui répond.
	Negative exponents		2007-01-11
		Bob pose la question : I have to write this "Y-7" (but the -7 is an exponent) as a positive exponent. How? Penny Nom lui répond.
	2 to the -5th power		2006-06-19
		Murray pose la question : Is 2 to the -5th power = -32? Penny Nom lui répond.
	Simplifying with negative exponents		2006-05-02
		Kristine pose la question : I am having a hard time understanding factoring and multiplying polynomials. I have a couple of problems I just can't get, can you please help me? Simplify, do not use negatives in the answer: (5a-1b-7)(-2a4b2) and: (5x2y-7z)(-4xy-3z-4) Stephen La Rocque lui répond.
	-3^4 and (-3)^4		2005-12-17
		Brad pose la question : What is the answer to -34 = ? -(3)4 = ? (-3)4 = ? Penny Nom lui répond.
	How do you simplify a fraction if one of the numbers is negative?		2005-12-05
		Stephanie pose la question : Question: How do you simplify a fraction if one of the numbers is negative? Ex. -32/40 Penny Nom lui répond.
	-120 divided by -15		2005-11-09
		Joshua pose la question : how do you evaluate -120 divided by (-15) Penny Nom lui répond.
	Adding positive and negative numbers		2005-09-03
		Billy pose la question : 46 + -24 = -38 + -22 = 19 - 20 = Penny Nom lui répond.
	12-42, 8-26, 10-34, 9-30, 16-58		2005-08-31
		Elizabeth pose la question : here is a math question my niece gave me, grade 7 12-42, 8-26, 10-34, 9-30, 16-58 first day of school and this is what they give her no explanation Harley Weston lui répond.
	Strategies for teaching operations with positive and negative decimal numbers		2005-02-02
		Erin pose la question : I am wondering if you can suggest any strategies for teaching operations with positive and negative decimal numbers that do not rely on rules that must be memorized? Diane Hanson lui répond.
	Two consecutive negative integers		2004-01-17
		Amanda pose la question : Find two consecutive negative intergers whose product is 182. Penny Nom lui répond.
	Positive, negative and zero		2003-09-04
		Brian pose la question : Can the Value of zero be positive or can it be negative or can it be both. Penny Nom lui répond.
	The sum of two numbers is 5 and their difference is		2003-06-16
		Akhil pose la question : The sum of two numbers is 5 and their difference is 11. What is the product of the two numbers? Penny Nom lui répond.
	F = -3 + 3		2002-03-19
		Jessica pose la question : F= -3 + 3 WHAT IS F????? Penny Nom lui répond.
	Negative exponents		2002-01-16
		Julie pose la question : If z to the power of -4= 1/z4 then how would you solve 1/t-2? Penny Nom lui répond.
	Negative numbers		2001-11-15
		Jewel pose la question : If zero means nothing or an empty set, then how can a number be less than zero, as in negative number? My understanding of negative numbers is distance from a set point in a given direction. Thus having a negative and positive side of a line is arbritary and is related to displacement rather than value. Am I in error? Penny Nom lui répond.
	Squares of negative numbers		2001-11-03
		Susana pose la question : I wanted to know if I can square a negative number..? Leeanne Boehm lui répond.
	(-3)to the power 2, divided by 3		2001-10-31
		Raz pose la question : what is (-3)to the power 2, divided by 3= Penny Nom lui répond.
	Negative times negative is positive		2001-10-26
		Mary pose la question : I have a question about adding and multiplying positive and negative numbers. When we add two negative numbers the answer is negative BUT when we multiply two negative numbers the answer is positive. I don't understand. Why? Penny Nom lui répond.
	Why do you flip the inequality sign?		2001-10-26
		Sean pose la question : I have a question about an inequality problem. Here it is: Solve and graph 5 - 3x => 17. (=> is greater than or equal). Please tell me why you flip the inequality sign when divinding by a negative number. Penny Nom lui répond.
	Integers		2001-09-09
		A student pose la question : I am a Grade 9 student from Ontario Canada who has never understood how to do integers very well. I was wondering if you would be able to either send me some sites that will tell me how to calculate them in a simple way or if you would be able to write me back and give me some pointers. Leeanne Boehm lui répond.
	A negative times a negative		2000-02-29
		Michael J. Butler pose la question : I have reviewed the answer in relation to the question of why (-3)x(-2)=6; however, I am still not able to properly explain the reasoning to my son, Jonathan, who is in grade 7. I want him to understand the reason for the rule that the multiplication or division of two negative numbers equals a positive number. Can you help? Chris Fisher lui répond.
	-log(a)		1999-10-22
		Brenda Miskimmin pose la question : I need to know the mercury concentration in mg/L or ng/L for the following: -log M (Hg) = 8.5 where mw of Hg=200.59 (it's the negative sign in front of log that confuses me). Harley Weston lui répond.
	Is zero positive?		1999-09-03
		Shah pose la question : Is zero a positive integer? Penny Nom lui répond.
	A double negative		1999-09-01
		Dennis pose la question : If b = -2 what does -b = ? As in (a + 8.5) - [(-b) + |c|] a = 1.5, c = -1.7 Penny Nom lui répond.
	Division by a negative		1999-08-19
		Sangeeta B. pose la question : 56/-8 Penny Nom lui répond.
	Negative Primes.		1997-11-10
		Leah Zucker and Paul Michael pose la question : I have received the following question via e-mail from my granddaughter: "Can negative numbers (like -7) be prime? If not, why not?" Chris Fisher lui répond.
	(-3)x(-2)		1995-10-25
		Azmat pose la question : Why is (-3)x(-2) = 6? Herley Weston and Ed Giesbrecht lui répond.

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