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OpenStudy (anonymous):
y varies directly as the square of x. When x = 2, y = 40. Find x when y = 640
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OpenStudy (imtant):
x=2,y=40 x=?,y=640 So multiply them crossly, you will get 2(640)=40(?) Then you can get the x. 1280=40(?) x=?
OpenStudy (anonymous):
32?
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