Functions | Evaluate the functions

Let f(x) = 1-x^2 if x is less than or equal to 0
2x+1 if x is greater than 0
Evaluate f(-2) and f(1)
If f(x) = x^2 +2x-1 and g(x)=2x-3, find each of the following functions
a. f◦g
b. g◦f
c. g◦g◦g
From the Diagnostic Test: Functions items #6 and #7 at The Calculus 7th Edition by James Stewart (p. xxvii)
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