SOLUTION: z varies directly as x squared. If z=48 when x=4, find z when x=5

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Question 1068155: z varies directly as x squared. If z=48 when x=4, find z when x=5
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
z=kx^2
48=k*4^2=16k
k=3
now use k in the second part
z=3*5^2=3*25=75