Question

CAN YOU HELP ME FIND THE SIMPLIFIED FORM OF THESE PROBLEMS!

1. (x^-4)^5

x^20
1/x^20
x/20
1/x^1,024

2. (-x^6)^3

-x^18
-x^9
x^3
x^18

3. (q^9)^2

2q^18
q^18
q^81
q^11

4. (x^-3)^-5x^6

x^21
x^-21
x^48
x^-48

5. (5t^3)^-4

625/t^12
20/t7
1/625t^12
1/20t^7

6. (x/2y^5)^-2

x^2/4y^10
4y^25/x^2
4y^10/x^2
x^2/4y^25

7. (x^3/2y^6)^-3

x^9/8y^18
8y^18/x^9
6y^9/x^6
x^6/-6y^9

I also need help with this:

8. What is the value of 12x^-3y^-1 for x = -1 and y = 5?
-12/5
-180
7,500
-5/12