CAN SOMEONE PLEASE HELP ME WITH MY MATH QUESTION

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

Which expression gives the area of the triangle shown below

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.