Joe goes to the store to buy jeans and some T-shirts. The jeans cost $40 each and the T-shirts cost $20 each. If Joe spends $160 on 5 items,
how many pairs of jeans and how many T-shirts did he buy?

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.