Negative exponents - all of the following expressions are equal except

The last one x^4.

A: If you bring 2^-5 to the numerator which is what the - expects you to do, then you get x^5 which is 32

B: No problem here. 32 = 32

C: 2^1 * 2^4 = 2^(1 + 4) = 2^5.

C: 2^5 is 32

D: 2^4 = 16.

D does not agree with the others.

C is the answer because 14 times 8 equals 112, the amount of money you'd get at 14 hours.