







Proportionality 
20091103 

Nazrul pose la question : If x is proportional to y , how can I prove that (x^2y^2) is proportional to xy.
Please explain the process. Penny Nom lui répond. 





Proportionality 
20090629 

Nazrul pose la question : If x is proportional to y and y is proportional to z , how can I prove that (x^2+y^2)^3/2 is proportional to z^3 Harley Weston lui répond. 





Direct and inverse relationships 
20090406 

allison pose la question : A piece of string is cut into n pieces of equal lengths L
(1) does n vary directly or inversely with L Penny Nom lui répond. 





Direct variation 
20071007 

Kimberly pose la question : If y is directly proportional to the square of x,
and x=2 when y=12, then what is the value of y when x=3? Penny Nom lui répond. 





Direct variation 
20070507 

Jennifer pose la question : assume that y varies directly as x. find y when x = 54 if y =1/4 when x=3/2 Stephen La Rocque lui répond. 





Direct and inverse Variation 
20070403 

liz pose la question : how do you tell if an equation varies Directly or Inversely? ex.
x= 2y or
xy+12=3
i know that if you have three numbers (x. y, z) that it varies jointly but how do you tell if it is Inverse or Direct?
Thanks for the Help!
liz Stephen La Rocque lui répond. 





What is the intensity 5m below the surface? 
20070331 

david pose la question : I have this question which I am supposed to set it up and solve as a differential equation. I know how to solve the diffrential equation but I am having hard time understanding this question. Here is the question: The intensity of light in the ocean decreases the deeper you dive. In fact, the rate at which the intensity decreases is proportional to the current intensity. Setup the corresponding differential equation and solve for I(Y), the intensity I as a function of current intensity Y. If the light intensity 2m below the surface is 25% of the intensity at the surface, what is the intensity 5m below the surface. Can you please explain to me what does it mean by current intensity and how do I set this equation up. Thanks for the help. Penny Nom lui répond. 





Direct and inverse variation 
20070303 

Rene pose la question : Hi I'm Rene, I'm stuck with some problems in direct and inverse variation.
I know how to solve direct and inverse problems when only one variation is in a question at a time.
EX: p varies inversely as the square root of q, and when p=12, q=36 find p when q=16
12*6 =p*4 72=4p 18=p
But how would you solve a problem like.....
If s varies directly as r and inversely as t, and s=10 when r=5 and t=3, for what value of t will s=3 when r=4 ? Penny Nom lui répond. 





What is the diameter of the planet? 
20061207 

Niall pose la question : In April 2005, scientists claimed to have captured light from an extrasolar planet orbiting a brown dwarf in the constellation Hydra some 230 lightyears from Earth. The scientists believe the planet is about five times the mass of Jupiter.
Assume the planet has the same density as Jupiter. What is the diameter of the planet? Stephen La Rocque lui répond. 





Direct variation 
20061105 

Johann pose la question : The perimeter of regular octagon varies directly with the length of one side of the octagon Stephen La Rocque lui répond. 





Direct and Inverse variation 
20061027 

Vishalinee pose la question :
i'm not sure how to use the words direct variation and inverse variation to describe thre relationship between: a. speed and distance b.speed and time c. distance and time. and then i need to create equations using the descriptions. i am really messed up with direct and inverse variation. Karen McIver lui répond. 





Direct and inverse variation 
20041005 

Abraham pose la question : Given that y varies inversely as x and x varies directly as z.If z is doubled then y is halved.Why is that true.Please explain.I'm having trouble understanding the different types of variation Penny Nom lui répond. 





A linear function 
20020909 

Chad pose la question : If y = 9x  13 does it represent a linear function? And if it does what is its slope and is it a direct variation? Peny Nom lui répond. 





Direct and inverse variation 
20001212 

Ashley pose la question : I'm stuck on this unit of direct and inverse variation..please and my problems and show me how to do each PLEASE!!! Assume that y varies directly as x If y= 4 when x = 2, find y when x= 6 Assume that y varies inversely as x If y =4 when x=2, find y when x =6 Penny Nom lui répond. 

