You win a prize and are offered two choices:
choice a: $0.10 on january 1, $0.20 on january 2, $0.40 on january 3, $0.80 on january 4, doubling the amount each day, or
choice b: $5.00 on the first day, $10.00 on the second day, $15.00 on the third day, getting $5.00 more each day.
which of the choices could be represented by a linear equation?

1)choice a
2)neither is linear
3)choice b
4)not enough information is given.