If a (x)= 2x -4 and b(x) = X +2, which of the following expressions produces a quadric function?

Can someone pls ! pls answer all. no explanation needed..

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.

Asphere has a diameter of 10 in. what is the volume of the sphere?