Can someone explain how to do this????

Question

Write each expression using a single exponent.

x^9/x^2

Answers:
x^11
x^7
7
x^5

Answer 1

x^(9-2) = x^7

because

x^a * x^b = x^(a+b)

like
2^2 * x^3 = 2^5 = 32 which is also 4*8

Answer 2

excuse me, typo
like
2^2 * 2^3 = 2^5 = 32 which is also 4*8