Question

A few algebra1 questions.
1. Simplify this expression. (–4)^–6(–4)^7
A. 4^13
B. -4
C. 13
D. 1
2. What is the simplified form of the expression? (y^–5)^–10 y^10
A. Y^-60
B. Y^60
C. Y^-150
3. Radio signals travel at a rate 3 × 108 of meters per second. How many seconds would it take for a radio signal to travel from a satellite to the surface of the Earth if the satellite is orbiting at a height of 3.6 × 107 meters?
A. 8.3 Seconds.
B. 1.2 x 10^-1 seconds.
C. 1.08 x 10^16 seconds.
D. 10.8 x 10^15 seconds.
I did the other 27 i just need help on these ones, Thanks & Please show work

Answer 1

1.