I need help and an explanation, not just the answer please:)
"The seats at a local baseball stadium are arranged so that each row has five more seats than the row in front of it. If there are four seats in the first row, how many total seats are in the first 24 rows?"

Question

I need help and an explanation, not just the answer please:)
"The seats at a local baseball stadium are arranged so that each row has five more seats than the row in front of it. If there are four seats in the first row, how many total seats are in the first 24 rows?"

anonymous · Answer

It's progressive. Have you written it out?

anonymous · Answer

Yeah. But the answer's given are:
1,428

 1,476

 2,856

 2,952

ghazi · Answer

@amistre64  i can find the series but unable to generalize ..help!

anonymous · Answer

I've got it now but thanks guys!:)

amistre64 · Answer

$$r_n =r_{n-1}+5;~r_1=4,~find~r_{24} $$

he seats at a local baseball stadium are arranged so that each row has five more seats than the row in front of it. If there are four seats in the first row, how many total seats are in the first 24 rows?"

ghazi · Answer

@amistre64  thank you !! @breberea  good question ....

amistre64 · Answer

rn = 4 + 5(n-1)

amistre64 · Answer

the summation of an arith seq is:

n(first+last)/2

24(4+(4+5(32))/2

amistre64 · Answer

23  not 32 :)

anonymous · Answer

haha i've got it! its 1472! But thanks though:)

amistre64 · Answer

1472 wasnt an option :/

amistre64 · Answer

1476 is better if we allow for typos ;)