What is the general equation of a sine function with an amplitude of 6, a period of pi/4, and a horizontal shift of pi/2?

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.

Louis wants to carpet the rectangular floor of his basement. the basement has an area of 864 square feet. the width of the basement is 2/3 it's length. what is the length of louis's basement

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?