Question

if y=x^3/z^2,what happens to the value of y when both x and z are doubled?
A)y does not change
B)y is halved
c)y is doubled
d)y is multiplied by 4
e)y is multiplied by 8

Answer 1

E i am sure Here is how you go about solving it:
y=5(2x)^3/2z, i.e, the values of x and z are multiplied by 2,
Then: y=5*8*x^3/2z
y=(5x^3/z)*(8/2)=(5x^3/z)*4

Answer 2

replace x with 2x and z with 2z in the expression and see what you end up with