X – 2y = 15
2x + 3y = 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.

Find the value of x. round the length to the nearest tenth

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)