find the first five terms of the sequence described by the following recursive formula.

an = 2n • an-1 where a1 = −3
a2=
a3=
a4=
a5=

If a sprinkler waters 1 over 12 of a lawn in 1 over 2 hour, how much time will it take to water the entire lawn? (5 points) 10 hours 6 hours 1 over 6 hour 7 over 12 hour