The amount in grams of a drug in the bodythours after taking a pill is given byA(t)=25(0.7)^t.

(a) What is the initial dose given (include units in your answer)

(b) What percent of the drug leaves the body after each hour? (in %)

(c) What is the amount of drug left after 13 hours?

(include units in your answer, and retain at least three decimal places in your answer)