Joint Variation: what is "the square of z"?

[Reporter529]

y varies jointly with x and the square of z. One set of values is y=375 when x=3 and z=25. Find y when x=8 and z=6

what's the square of z?? z^2 or the square root of z?

 

[stapel]

"The square of" means "squared". "The square root of" means "the square root of".

Eliz.

 

[skeeter]

y varies jointly with x and the square of z

y = kxz², where k is the konstant of variation.