Posted by Angie on .
y varies directly as the cube of x and inversely as the square of z.
If y is 30 when x is 2 and z is 4:
b) Find the equation that models this data.
c) Find the value of y when x is 3 and z is 2.

Intermediate Algebra 
MathGuru,
y = kx^3/z^2 >y varies directly as the cube of x and inversely as the square of z.
Hopefully you can take it from here to answer your twopart question.