For these questions you’re distributing.
When multiplying exponents it’s quite simple
(x)(x)= x^2
(x^3)(x^3)= x^6
Raising a function with an exponent with another exponent
(x^4)^4 is x^16
So when two functions to a power are multiplied the exponents add. Then a function with an exponent is raised to another exponent, the exponents multiply.
b. 15h^2-10h
c. 12p^4-15pm
d. 12h^3+8h^2g
e. h^4+7h