Question

The Marco Movie Theatre has 20 seats in the first row, 22 in the second, 24 in the third and so on for a total of 19 rows. How many total seats are in the Theater?

Answer 1

You have the formula?

Answer 2

tn=t1+(n-1)d

Sn=n/2(t1+tn)

formulas I got

Answer 3

20=t1

Answer 4

2= common difference

Answer 5

I guess 19= N?

Answer 6

2 I think could= D

Answer 7

Formula I got

Answer 8

do u have to use that formula, coz I got another way

Answer 9

Nah you dont

Answer 10

An=a1+(n-1)d

Answer 11

20+(19-1)2

Answer 12

=56

Answer 13

now you use that other formula with 56

Answer 14

S(19)=19(20+56)/2

Answer 15

722 seats

Answer 16

So why do you need help if you can do it yourself xD
20+22+24+26+28+30+32+34+36+38+40+42+44+46+48+50+52+54+56=722

Answer 17

Cause I wonted a second opinion to see if I was right lol

Answer 18

yea you're right :P

Answer 19

Ill give you a medal for proving