Solve number 4 and evaluate and get the answer

What is the smallest integer n such that n\sqrt{2} is greater than 20

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee, f, for a single job is a function of the number, t, of hours it takes him to complete the job. write the function's formula.

Evaluate the expression. (9 + 5)(3 + 2)0