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	Direct, inverse and indirect proportionality		2009-03-04
		Brian pose la question : 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 Chris Fisher lui répond.
	A proof by contraposition		2006-03-16
		Eban pose la question : 1)by mathematical induction prove that 12 + 32 + 52 + ...... + (2k-1)2 = (1/3)k(2k-1)(2k+1) for all positive integers k. 2)show that the contrapositive of the following statement is true. if 1 + M7 is even, then M is odd. Stephen La Rocque lui répond.
	A linear function		2002-09-09
		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.
	Proportionality: direct and indirect		2001-01-18
		Nancy Ellis pose la question : What is the difference between directly proportional and indirectly proportional? Leeanne Boehm lui répond.

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