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Can some explain to be on what to do with a question like this:
Suppose a movie theater has 42 rows of seats and there are 29 seats in the first row. Each row after the first has 2 more seats than the row before it. How many seats are in the theater?
 one year ago
 one year ago
Can some explain to be on what to do with a question like this: Suppose a movie theater has 42 rows of seats and there are 29 seats in the first row. Each row after the first has 2 more seats than the row before it. How many seats are in the theater?
 one year ago
 one year ago

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BrittanyFrenchBest ResponseYou've already chosen the best response.0
I know it's using gemoetric or arithmetic stuff
 one year ago

SaikamBest ResponseYou've already chosen the best response.0
ok. so can u tell me how many seats in the second row?
 one year ago

itsmylifeBest ResponseYou've already chosen the best response.1
first row has 29 common difference is d=2, your a=29 , d=2 therefore in 42 rows there are total of \[Sn=\frac{ n }{ 2 }(2a+(n1)d)=\frac{ 42 }{ 2 }(2*29+(421)2)\] you can calculate now
 one year ago

itsmylifeBest ResponseYou've already chosen the best response.1
it should be 2940 seats
 one year ago

SaikamBest ResponseYou've already chosen the best response.0
yea. 29 + 2 and in the third its 29 + 2 + 2 = 29+4 in the fourth, it is 29 + 6 and so on... so the nth row would contain 29 + (n1)*2 This is the general term of an A.P. and you are asked to find the sum of the first 42 terms.
 one year ago

BrittanyFrenchBest ResponseYou've already chosen the best response.0
Dang that's alot of seats,and yeah I calculated that! Thank you..
 one year ago
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