Algebra questions (ten points!) Please please show work

1. (-3q^-1)^3q^2

2. (1.2)^5(1.2)^-2


3. r^3t^-7 / t^5

Thanks so much in advance!

1. (-3q^-1)^3 =( -3/q)^3 = -27/q^3

(-27/q^3)(q^2) cross multiplication

-27/q

2. (1.2^5 / 1) (1/1.2^2)

1.2^5 / 1.2^2 = 1.2^3 = 1.728

3. (r^3)(1/t^7) / t^5

r^3/t^7 / t^5

(r^3 / t^7) (1/t^5)

r^3 / t^12