Question

I have 5 questions, I really need help. I suck at math :/

1. Which expression is equivalent to 7-2?
a. 7 x -2
b. -7 x 2 x 2
c. 1/ 7*2*2
d. 1/7*2

2. Simplify 6-2
a. -18
b.18
c.-1/216
d. 1/216

3.Evaluate a-2 for a = 8.
a. 1/-16
b. 1/-64
c. 1/64
d.-64

4. What is the value of the base in the power (-125)-3?
a. -125
b. -3
c. 1/125
d. 375

5. Simplify b3 × b-3 for b = 5.
a. 1/125
b. 0
c. 1
d. 125

Answer 1

the first one is none or maybe something is miswritten

Answer 2

actually most of them if not all of them are not written correctly

Answer 3

I think so..