Answer:
10 g^4 h^9
Explanation:
-5gh^4 * (-2g^3 h^5)
Rewriting
-5*-2 g*g^3 h^4*h^5
When the bases are the same, we add the exponents (x^a * x^b = x^ (a+b)
There is an implied 1 if there is no exponent
-5*-2 g^1*g^3 h^4*h^5
10 * g^(1+3) h^(4+5)
10 g^4 h^9