SOLUTION: Z varies directly as x^2. If z=50 when x=5, find when x=7

Question 1199201: Z varies directly as x^2. If z=50 when x=5, find when x=7
Found 2 solutions by ikleyn, greenestamps:
Answer by ikleyn(52779) (Show Source): You can put this solution on YOUR website!
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The problem says that z = kx^2. It also says that 50 = k*5^2 = 25k, which implies k = 2. Hence, z = 2x^2. When x= 7, z = 2*7^2 = 2*49 = 98. ANSWER

Solved, with complete explanations.

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Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

z varies directly as the square of x, so when x changes by a factor of 7/5, z changes by a factor of (7/5)^2.

ANSWER:

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