Answer:
A. x= -12
B. y=4
Explanation:
A. The first one is called,
Product of Powers, a^m * a^n = a^m+n
a=7, m=-9, and n=-3
7^-9+-3=7^-12
x=-12
B. The second one is called,
Quotient of Powers, a^m/a^n = a^m-n
a=11, m=-4, and n=-8
11^-4-(-8)=4
(A negative minus a negative equals a positive)
y=4
Hope this was helpful, have a good day.