SOLUTION: Rick has zombies in his barn. On Monday he started adding 2 more zombies every day. On day 10 there were 30 zombies and his barn. Write an equation to model. how many zombies were

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Rick has zombies in his barn. On Monday he started adding 2 more zombies every day. On day 10 there were 30 zombies and his barn. Write an equation to model. how many zombies were       Log On


   

Question 1167674: Rick has zombies in his barn. On Monday he started adding 2 more zombies every day. On day 10 there were 30 zombies and his barn. Write an equation to model. how many zombies were in the barn to start?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
an=a1+(n-1)d
an is day 10 so a10
a10=a1+(10-1)2=30
12=a1 , the number on day 1