need help to solve, please see attached

Air Purication During testing of a certain brand of air purifier, the amount of smoke remaining (as a percent of the original amount) 1' min after the start of the test was given by the following function. A(t) = 70.00006? + 0.00463r4 7 0.1497:3 + 1.555:2 7 17.53: + 93 Compute the following values. mm = :x mm = :x