math problems with exponents.

Question

i also need help with these questions .

which expression is equivalent to (7 ^ - 8 ) (7 ^ 3)

A. 49 ^ - 5 B. 49 ^ - 11 C. 7 ^ - 5 D. 7 ^ - 11

which expression is equivalent to

A. 5 ^ 12 B. 5 ^ 7 C. 1/5 ^ 6 D. 1/5 ^ 40

Answer 1

(7 ^ - 8 ) (7 ^ 3) to solve this you need to add the exponents

1. -8 + 3 = -5

so the correct option would be C. 7 ^ -5