Evaluate the exponent: 4^-3

a) -12
b) 1/64
c) - 1/12
d) - 1/64

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An negative exponent or power, means that the number elevated to that negative power is one divided by that number raised to the positive same power, that is:

x^-n = 1/x^n
n being a positive number. So in this case we have:
4^-3 = 1/4^3
= 1/(4*4*4)
= 1/64

The third box is a function

The first one is 2/3the second is 1/160the third is 4/125