Yes 7.5 is clearly the answer here
First write out your original equation.

Then use the law of exponents(power of a power) to simplify.

(Multiply the numerator and denominator exponents by the outside power.)
The answer is 4 to the 21st over 5 to the 6th.
(1/3)/(5)= 1/3 * 1/5 = 1/15 of a chocolate bar each friend gets
20lbs is greater because 272 oz is 17lbs
hope it helps
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Is the equation2x2(9x+2-16) if so you would do -16+2 first which is -14
Then multiply 2x2 equals 4
4(9x-14)
Multiply the 4 to 9x and -14
You get 36x-56