Question

A new movie theater has stadium seating. The first row has 10 seats. Each additional row has 4 seats more than the row before it. How many seats are in the theater if there are 16 rows of seats?




a.


Write a sequence that shows the number of seats in each row.










b.


Use Gauss’ method to find the sum. Be sure to show and explain your work.

Answer 1

Are you still there?

Answer 2

yes

Answer 3

Okay, so for the first one, do you know how to write an arithmetic sequence?

Answer 4

Does this look familiar: a + (n-1)d ??

Answer 5

yes :)

Answer 6

okay, So what do you think a should be?

Answer 7

A ?

Answer 8

Take a guess.

Answer 9

Looks good.

Answer 10

so i got both of the question A and b ?

Answer 11

Pretty much

Answer 12

well what answer did you get ?

Answer 13

I got 640 for the summation of total chairs.

Answer 14

ok.

Answer 15

Do I get a medal?