Square function

If z varies jointly as x and the square of y, and z = 20 when x = 4 and y = 2, find z when x = 2 and y = 4.

Final Answer:

z2 =  40

Step-by-step explanation:

z=20 x=4 y=2  z = k   x y2  k=x y2z=4 2220=45=141=1.25  x2=2 y2=4  z2=k x2 y22=1.25 2 42=40



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