Question

PLEASE HELP !
#1: Evaluate the following expression: 6^-3

#2: If n^-2 = 1/16, then n could be which of the following?
a) -8
b) -4
c) -1/4
d) 1/4
e) 4

#3: Evaluate: m^0 - n^2 for m = 2 and n = -1.

#4: Evaluate: 2x-4y for x = 2 and y = 4.

#5: Simplify the following expression.
4a-2b