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If y varies directly as the square of x, and y=725 when x=25, what does y equal when x=40?
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Asked 4/5/2014 7:49:04 PM
Updated 4/13/2014 10:33:44 PM
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Flagged by yeswey [4/13/2014 10:30:18 PM]
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User: If y varies directly as the square of x, and y=725 when x=25, what does y equal when x=40?

Question
Asked 4/5/2014 7:49:04 PM
Updated 4/13/2014 10:33:44 PM
1 Answer/Comment
Flagged by yeswey [4/13/2014 10:30:18 PM]
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If y varies directly as the square of x, the equation is y = kx^2;
y=725 when x=25, k = y/x^2 = 725/25^2 = 725/625 = 1.16
The equation is: y = 1.16x^2
when x=40, y = 1.16(40^2) = 1.16(1600) = 1856
Added 4/13/2014 10:33:44 PM
This answer has been confirmed as correct and helpful.
Confirmed by jeifunk [4/13/2014 10:38:43 PM]
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