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	If x ix directly proportional to y then ...		2012-02-19
		From Crystal: I understand that we say x and y are proportional, then y = kx. Generally when we say x is proportional to y, we think that when x increases y increases. Now I am questioning whether that is actually true. If k is negative, then when x increases, y DECREASES. My question is does this mean this statement is incorrect: If x is proportional to y, when x increases, y increases proportionally. Is it more correct to say: If x is proportional to y, when x increases, y either increases proportionally or decreases proportionally. Along the same line of reasoning, when x is inversely proportional to y, we think that when x increases y decreases, but that is true only if k is positive. Is that correct? Answered by Harley Weston.
	The derivative of f(x) = (x+1)^1/2		2011-09-05
		From Carla: Find the derivative using the limit process of f(x) = (x+1)^1/2 Answered by Harley Weston.
	Using the limit definition		2010-06-06
		From Meagan: Using the limit definition find the derivative of 3/(2x^2) Answered by Harley Weston.
	Direct, inverse and indirect proportionality		2009-03-04
		From Brian: My 14 year old is confused about indirectly proportional and inversely proportional. On searching on the internet we were directed to: http://mathcentral.uregina.ca/QQ/database/QQ.09.00/ellis1.html Here leanne starts explaining indirectly proportional and ends up describing inversely proportional. Has Leanne got it wrong ? What is indirectly proportional. Thanks Brian Answered by Chris Fisher.
	y varies jointly as x and the square of z and...		2009-01-05
		From peter: I don't really get the terms in this problem. Could you explain it: If y varies jointly as x and the square of z and inversely as the cube of w, by what factor is y increased when z is doubled and w is divided by 3 and x remains the same? Answered by Harley Weston.
	The derivative of f(x)=1/(x-1)		2007-09-21
		From Michelle: im having trouble finding the derivative of f(x)=1/(x-1) using the f(x+h)-f(x)/h method. Answered by Stephen La Rocque.
	Direct variation		2007-05-07
		From Jennifer: assume that y varies directly as x. find y when x = 54 if y =1/4 when x=3/2 Answered by Stephen La Rocque.
	Direct variation		2006-11-05
		From Johann: The perimeter of regular octagon varies directly with the length of one side of the octagon Answered by Stephen La Rocque.

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