Explanation:
You have to substitute the value of the letters in all the expressions:
7.
(6-8)⁵/6-2(-8)² = 16/61
8.
5(-1)² -(-4)² +3/2(-1)-4(-4) = 4/33
9.
-9² -(-6)² +3(-20) = -117
10.
3 |3 -5|² -(3•(-5))² = -213
11.
2(-3)² -5(-3•(-2) -(-2)³ = -4
12.
-(-4)² +7(-2)⁴ -2(-3)³ = 150