a committee must be formed with 2 teachers and 4 students. if there are 10 teachers to choose from, and 10 students, how many different ways could the committee be made

A(t)=728(1+0.04)^t how much money did aditya originally invest

Can someone me with this problem . show your work .

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?