A1, a1r 1, a1r 2, a1r 3, a1r 4, a1r n-1 is the general formula for the sum of a what?

What is the definition of exponential decay?

Cora bought a package of erasers. there are 4 pink erasers and 12 blue erasers. what is the ratio of pink erasers to blue erasers?

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts