You buy 80 of your favorite songs from a web site that charges $0.98 for each song. what is the cost of 80 songs? use mental math.

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.

Asap! i'm not good math and i'm lost.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way