Plzzz help meh my teacher wants me done before 2:45

Molly shared a spool of ribbon with 12 people. each person received 3 feet of ribbon. which equation can she use to find r, the number of feet of ribbon that her spool originally had?

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?