Sorry i forgot to set the last questions as fifty points. same quesion as before radius, height, and lateral area

Math i have no idea how to do a and b

Aright cylinder has a diameter of 8 m and a height of 6m. what is the volume of the cylinder

As a salesperson you get $50/day and $3.60/each sales you make.if you want to make $60 in one day, how many sales would you need need to make ? a 3b 4c 5d 6 show work.