In a 20 row theater, the number of seats in a row increases by three with each successive row. The first row has 18 seats. Find the total seating capacity of the theater.

Question

stamp · Answer

Arithmetic sequence?

stamp · Answer

Initial term is 18, +3 each iteration for 20 iterations, find the sum.

anonymous · Answer

Yes, I am still trying to get the hang of that so Im not sure how to write it out to figure the answer.

anonymous · Answer

18, 21, 24, 27...

anonymous · Answer

ugghhh, so confused :-(

stamp · Answer

http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html

mertsj · Answer

I'm pretty sure we solved this last week.

mertsj · Answer

Find the sum of this arithmetic sequence 18, 21 24, 27 30, 33,36,39,42,45,48,51,54,57,60,63,66,69,72,75