Solve the following problems.
Given:
A. p(x)=x²-2x+2
B. q(x)=3x+1
C. r(x)=x
D. s(x)=x-1

Find:

1. p(r(x))=
2. q(s(x))=
3. s(q(x))=
4. s(s(x))=

Thank you