Range is the outputs possible
w(r(x))=(2-x^2)-2
w(r(x))=2-x^2-2
w(r(x))=-x^2
therefor the range is from 0 to -∞
There are 4 terms in the expression
ANSWER

EXPLANATION
Given the exponential function,

Then the function

is stretched vertically by a factor of 'a' units, for a>0.
Based on this, if a=4 and

Then the equation of the new function is

2 x 3 x 3 x 3 = 54
2 x 3 = 6
3 x 3 = 9
6 x 9 = 54
hope this helps :P