An oak tree is 120 feet taller than the adjacent house. if the tree is also two and a half times the height of the house, how tall is the house? choices for the height of the house 70, 80, 90

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.