Sujet: phi liste de sujets
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	l'équation d'une rotation dans un graphique cartésien		2001-11-14
		Ghaith pose la question : je d6sir que vous me rafraichissez un peu la mémoire s.v.p. j'aimerai savoir l'équation d'une rotation dans un graphique cartésien merci Claude Tardif lui répond.
	isomorphisme		2000-08-10
		Romain Kroes pose la question : Pour les beoins d'un ouvrage d'économie que je suis en train de terminer, pouvez-vous me dire qui est (sont) l'inventeur de l' "isomorphisme" en mathématiques (calcul tensoriel)? Claude Tardif lui répond.
	la pantographie		1999-11-18
		Erick et Christine pose la question : Nous recherchons la définition de pantographie voltaïque, que représente cette "figure" ? est-ce qu'on peut en définir une unité de mesure ? Claude Tardif lui répond.
	A system of inequalities		2020-02-01
		Isaac pose la question : Austin has x nickels and y dimes, having a maximum of 15 coins worth a minimum of $1 combined. No more than 4 of the coins are nickels and no less than 11 of the coins are dimes. Solve this system of inequalities graphically and determine one possible solution. Penny Nom lui répond.
	Investigating y = (-2)^x		2020-01-13
		Gonzalo pose la question : This is not precisely a maths question, but it is formulated based on my maths curiosity. Fidgetting with my new graphic calculator, I started graphing things and had the idea to graph $y=(-2)^x.$ The result surprised me, and I thought a little bit about it, stored it on the back of my brain, and promised myself to look deeper into it someday. Harley Weston lui répond.
	Graphing piecewise functions		2014-03-29
		Rayven pose la question : Hi! I'm in eighth grade, taking ninth grade algebra 1. I'm confused as to how to graph piecewise functions. I know that you have already answered a question similar to this (I did my research first) but it didn't completely help me on my homework. I have to graph piecewise functions for the specified domains, and create a table for the absolute values. I know that two bars around a number means absolute value (two bars around -2 makes it +2) , but how do I graph and chart the absolute value for the following: f(x)= |x+3 | for -5≤x≤3 And then graph and chart: (on a separate graph): f(x)= {x if x≤0 {x+1 if x <0 thank you! ~Rayven Penny Nom lui répond.
	What does y= f(x) actually mean?		2013-12-31
		John pose la question : I don't understand how to pick coordinates for y=f(x). I took a look at your answer to a previous question here: http://mathcentral.uregina.ca/QQ/database/QQ.09.00/monica2.html What does y= f(x) actually mean? Penny Nom lui répond.
	Solve sin 3x = -0.1254 with x between o and 360 degrees		2013-02-21
		David pose la question : sin 3x = -0.1254 0 Harley Weston lui répond.
	Solve sin 3x = -0.1254 with 0		2013-02-21
		David pose la question : sin 3x = -0.1254 0 Harley Weston lui répond.
	2 + f(x) and f(x) + 2		2011-11-21
		Beth pose la question : Do you do y=2+f(x) the same way as if the 2 came after the equation such as y=f(x) +2 when graphing? Penny Nom lui répond.
	Linear inequalities		2011-03-25
		Alice pose la question : OK. I'm in algebra 1 and the linear inequality is y<2x-1 y>2 I don't completely know how to graph y>2 and I'm getting really frustrated Please help me in any way possible! Thank You! Penny Nom lui répond.
	Modelling the roof of a house		2010-03-23
		Sandi pose la question : This question has been haunting my dreams at night. It states the cross section of the roof of a house is modelled by the function y= -5\12|x-12|+5, where y>0 or y. Now I'm suppose to graph the function. b) Find the slope, height, length of sides, and base of the isosceles triangle. c)Explain what transformation must be applied to the graph of y=|x| to obtain the graph of y= -5\12|x-12|+5, where y>0 or y=0. 1st I put the equation into my calculator and graphed it. I got 10 for the height. We have had 2 sub teachers this past week. The first one told me the height should be 12 the other one told me 5. So I'm really confused. If I use my 10 units as height and the Pythagorean Theorem I get my sides to be 26 units the base 48 and my slope I calc to be 5/12. Both teachers are pretty sure I'm wrong and they are right but we all have different answers. Please help put this problem to rest so I can rest soundly at night. Thank you for your time. Penny Nom lui répond.
	Using graphs		2010-01-04
		Armstrong pose la question : Given that 50 litres of kerosine costs 6000 nira. Draw a graph and read off; A: The costs of 15 and 34 liters. B: The number of litres that can be bought for 2300 nira. Robert Dawson lui répond.
	y=2x+1 and y=2x-1		2009-08-28
		MARICELA pose la question : Need help of how to work this problems y=2x+1 and y=2x-1 First of all what is the difference? Second I think is easy just to work with the X y with the line in the middle but how do you get the numbers for each side. Penny Nom lui répond.
	Graph 2x-3y+15=0		2009-08-20
		Diem pose la question : Graph 2x-3y+15=0 Leeanne Boehm lui répond.
	Stairway construction		2009-05-02
		Olivia pose la question : Hi, I'm Olivia and I'm in 8th grade studying algebra 1. I'm having some trouble with my math project. It has to do with rules of stairway construction. It says that there are two generally accepted rules to building stairs. Rule 1: x+y=43 and x+y=46 (cm) Rule 2: 2y+x=61 and 2y+x=64 (y is the riser and x is the tread length) I cant figure out how to graph them...it says they're supposed to intersect to make a square which is like the safety zone for building stairs (the stairs' rise and tread lengths are plotted as points) any points outside of that square are considered unsafe. Did i explain it ok? Thanks for your help. --olivia Penny Nom lui répond.
	Graphing		2008-12-09
		Natasha pose la question : 2x+y=5 Robert Dawson lui répond.
	Scaling a logo		2008-10-20
		Carl pose la question : Hello! I hope that you can help me out here. I've been trying to figure this out for awhile now and can't come up with the answer logically. I am a graphic designer by trade and need to figure out how large my client's logo should be. The logo will need to be sized proportionally with the surface area of the page. The logo will always be sized at 1.2938(w) x .75(h) on a letter size page (8.5 x 11). My question is... When you increase the size of the page (not always proportionally sized - dimensionally) how do figure out the NEW size of the logo. I could have a page 20" x 40" or 30' x 4'... or ANY size really. I believe I have the new surface area of the logo but can't find the new dimensions. Harley Weston lui répond.
	Concavity and the second derivative		2008-10-15
		Christina pose la question : I'm having trouble solving for a second derivative for the following graphing question. f(x) = (X^2+2x+4)/2x using the quotient rule, I found: f'(x) = (x^2-4)/(2x^2) however, using the quotient rule again I can't seem to solve it (concavity): f'''(x)=[(2x)(2x^2)-(x^2-4)(4x)]/[(2x^2)^2] f''(x)=[(4x^3-(4x^3 -16x)]/4x^4 f''(x)=16x/4x^4 f''(x)=4/x^3 and making the equation equal to zero result in 0=4 which doesn't seem to make sense... Penny Nom lui répond.
	Graphing a piecewise function		2008-08-12
		Shanti pose la question : how do you graph a step function or piecewise function such as u^2 if u is greater than or equal to -2 and less than 1 2- u if u is greater than or equal to 1 and less than 4 Penny Nom lui répond.
	Two equations in two unknowns		2008-08-01
		James pose la question : Question from james, a student: 3x+2y=9;24x-2y=18 My math teacher says that it is (2,-4) Can someone please explain how to figure this out by graphing? Victoria West lui répond.
	Graphing Using Double Angle Identities		2008-07-16
		Hodan pose la question : the Question is: Describe how you could use your knowledge of Double angle formulas to sketch the graph of each function. Include a sketch with your description.A) F(x)=sin x cos x B)F(x)=2 cos(squared)x C) F(x)= tan(x) (divided) by 1-tan(squared) x Janice Cotcher lui répond.
	Domain & Range of a Periodic Function		2008-07-11
		Michelle pose la question : The depth, w metres, of water in a lake can be modelled by the function, w=5sin(31.5n+63) +12 where n is the number of months since January 1, 1995. Identify and explain the restrictions on the domain and range of this function. Janice Cotcher lui répond.
	Plotting a function		2007-12-06
		Paula pose la question : My son has a problem that says plot the point: 2x-3y=9 I have explained to him that there must be a function for y in order to plot that point, but he doesn't think so. The question above that one says find the function for y, and I assume we should use that function. Am I wrong? Can we plot a point without a y function. Stephen La Rocque lui répond.
	x = y^2 and x = -4 y^2		2007-09-11
		Jil pose la question : My question is when dealing with parabolas, x=y^2, so that they are sifted on their side you could say, what will happen to the graph if you change it to x=-4y^2. I understand that the - flips the graph in the other direction but can you simply just plug in numbers and increase the stretch of the y? Penny Nom lui répond.
	Explain how you can shift a parabola up two units		2007-08-14
		Marsia pose la question : Explain how you can shift a parabola up two units (y axis). Stephen La Rocque lui répond.
	Circumscribing a golden cuboid with a sphere: surface areas		2007-06-14
		Ainslie pose la question : A golden cuboid is defined as a rectangular prism whose length, width and height are in the ratio of phi : 1 : 1/phi. Prove that the ratio of the Surface Areas of the golden cuboid to that of the sphere that circumscribes it is Phi : Pi. Stephen La Rocque lui répond.
	Finding a parabola's equation by looking at its graph		2007-04-30
		Kenzie pose la question : The graph shows an arrow going upward crossing at the -2 on the x line and crossing the 3 on the x line and the vertex on the -6 on the y line. Stephen La Rocque lui répond.
	A linear system		2007-01-04
		Harold pose la question : System A (4, 2/3) 2x-3y=6 and x-3y=2 I approached this problem using the addition method. Could i have found the answer using the graphing method? Penny Nom lui répond.
	The graph of y = 2x + 1		2006-02-23
		Geneva pose la question : I'm having trouble with graphing equations like y=2x+1 which is my homework I'm not sure how to graph it. I'm in the 8th grade taking a 9th grade course algebra I. Penny Nom lui répond.
	Open dots and closed dots		2005-09-29
		Cynthia pose la question : When graphing the solutions of an inequality, what is the difference between an open dot and a closed dot? Penny lui répond.
	Graphing a linear inequality		2005-08-26
		Gina pose la question : When graphing a linear inequality, how do you know if the inequality represents the area above the line? Penny Nom lui répond.
	Graphing an inequality		2005-05-02
		Janice pose la question : I need to know how to graph inequalities. I need to know just abot everything. From graphing an equation to shading. Leeanne Boehm lui répond.
	Perfecting an ideal gambling system		2005-03-06
		Gaz pose la question : I am a screenwriter, currently in the fortunate position of having the development of a Screenplay funded by the South Australian Film Corporation. The (anti)hero of this screenplay is a statistician whose life is falling apart around him, thanks in part to his obsession with perfecting an "ideal" gambling system. Andrei Volodin lui répond.
	Graphing inequalities		2005-02-15
		Melanie pose la question : Solve and Graph the following variable inequalities: y<2x+4 y>-2x+6 3x+4y<-24 4x-6y>-24 Penny lui répond.
	Graphing lines		2004-02-08
		A student pose la question : how do you solve y=1\3x+3 and y=1\3x-3 by graphing? Penny Nom lui répond.
	Intercepts		2003-11-04
		A student pose la question : I am totally confused on how to determine intercepts of an equation and then to graph the line. For example, how to determine the intercepts of 2x-3y-12=0. Penny Nom lui répond.
	Graphing a piecewise function		2003-08-24
		Amber pose la question : How do i begin to graph a piecewise function, absolute function or step function? Penny Nom lui répond.
	Graphing equations		2001-05-01
		A student pose la question : If, for example, 4x2-12x+9=0 and -4x2+12x-9=0, which I'm assuming it does since you can derive that equation from the first, why do those two equations have different graphs? Penny Nom lui répond.
	Graphing F(x) = 3x		2000-11-06
		Jose pose la question : graph the exponential problem F(x)=3x Harley Weston lui répond.
	Graphing an inequality		2000-08-02
		Lori pose la question : How do I find x and y and graph this problem 3x + y < 5 Penny Nom lui répond.
	Graphing a linear function		2000-05-17
		Chelsea pose la question : I need help with grahing linear functions.If you could e-mail me back the basics and how tos I would be much appriciative. Penny Nom lui répond.
	A matrix equation		2000-05-14
		A student pose la question : Right now, we are dealing with matrices and we are supposed to solve the following problem on our graphing-calculators: 2a+3b-4c+d=20 a-2b+3c-5d=-14 3a+4b-2c+3d=19 5a-b+6c+4d=-5 Penny Nom lui répond.
	Graphing cube roots		2000-04-27
		Heather Jones pose la question : What do the graphs of cube roots look like? Walter Whiteley lui répond.
	Factoring by graphing		2000-01-11
		Dylan Kirkwood pose la question : How can you factor a quadratic equation by graphing it? Penny Nom lui répond.
	Fibonacci Numbers		1999-12-15
		Gary Nelb pose la question : I'm doing a project on fibonacci numbers and I'm using different starting values and finding out if different starting values to see whether or not the ratios still get closer to phi. I was wondering, what numbers should I use. Should I use two of the same # like 2 and 2, or numbers like 1 and 2, or even something totally different. Denis Hanson lui répond.
	Stem and Leaf Plot		1999-09-14
		Jeanette Sovick pose la question : My 5th grade son brought home a math paper, the title of which reads, Reading Stem-and-Leaf Plots...can you explain this so I can explain it to him...There is no book, his teacher just sent this practice sheet home for him to complete and I have no clue! Penny Nom lui répond.
	Graphing a linear equation		1999-05-27
		Dylan Bradley pose la question : Im in Grade ten and am doing linear equations, I cann't figure out how to make a chart for questions like y = -2x + 3 Penny Nom lui répond.
	Graphing the Derivative		1999-01-18
		Milena Ghebre pose la question : This question has been nagging me for sometime now. Is there a way of finding out the derivative of a function, just by looking at the graph of it? Walter Whiteley lui répond.
	Intersection of planes		1998-11-22
		Dave Rasmussen pose la question : I am a teacher of secondary mathematics with a question about the uses of Three Dimensional Co-ordinate Geometry. I have been teaching my students to write equations of planes and lines, - to find the intersection of these and the distance between them. What I am having difficulty finding are good applications of these techniques to "real world" situations. Can anybody help me? Walter Whiteley and Harley Weston lui répond.
	Graphing Inequalities of Conic Sections		1997-03-24
		James Sheldon pose la question : I'm trying to graph Systems of Conic Sections with inequalities, but I'm running into problems on which area to shade: x^2+y^2 is greater than or equal to 16 xy > 4 So I graph these two equations, and then my teacher said to substitute a point into it but I'm still not sure how to do it... Penny Nom lui répond.
	How do you graph these inequalities?		1996-05-17
		Robert pose la question : How do you graph the inequalities 5+gg, and g+h>6 on one coordinate plane? Harley Weston and Maxine Stinka lui répond.
	How do you graph these equations?		1996-04-30
		David Gamble pose la question : How do you graph the equation x=3 on a x,y graph? Also how do you graph f(x)=-3x + 2 on the same graph? Harley Weston and Maxine Stinka lui répond.

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