Answer:
if I can't explain in one line, then I will include the steps in the explanation.
Step-by-step explanation(Q3):
[tex]3^2-\left(5-3\right)^3+6\\5-3=2\\3^2-2^3+6\\3^2=9\\9-2^3+6\\2^3=8\\9-8+6\\9-8=1\\1+6\\1+6=7\\=7[/tex]
Hope it helps!