Which of these is NOT equivalent to 2^−3?

−2^3

2(14)^2

2^2 • 2^−5

(12)^3

Thank you! This question is from Imagine Math

Keith bought a package with 2 9/16 pounds of ground meat to make hamburgers he has 2/5 pound of grounded meat left about how many pounds of grounded meat did he use for the hamburgers