This is for math help!

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.

The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.2 days and a standard deviation of 1.7 days. what is the probability of spending more than 2 days in recovery? (round your answer to four decimal places.)