Plz help! I need to solve this by today

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 each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42

Aramp rises 4 feet over a distance of 10 feet. what is the length of the ramp?