Corey’s parents agree to loan Corey $182 to help pay

for the school’s spring music trip to Florida. Corey agrees to

monthly payback amounts of $2, $4, $6, $8, and so on. How long

will it take Corey to pay back the $182?

Please help!

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- Jan 24th 2013, 09:03 PMGNUF36th grade math help
Corey’s parents agree to loan Corey $182 to help pay

for the school’s spring music trip to Florida. Corey agrees to

monthly payback amounts of $2, $4, $6, $8, and so on. How long

will it take Corey to pay back the $182?

Please help! - Jan 24th 2013, 10:03 PMibduttRe: 6th grade math help
- Jan 25th 2013, 07:20 AMtopsquarkRe: 6th grade math help
- Jan 25th 2013, 08:46 AMpspssRe: 6th grade math help
Sn = 2 + 4 + 6 + 8 + ... = 182

2(1 + 2 + 3 + ... n) = 182

2n(n + 1)/2 = 182

n(n + 1) = 182

182 = 2 × 7 × 13 = 13 × 14

n = 13

in 13 months Corey to pay back the $182

---- - Jan 25th 2013, 10:26 AMHallsofIvyRe: 6th grade math help
GNUF3, do you understand that you could have done this with a few minutes of integer arithmetic?

2+ 4= 6

6+ 6= 12

12+ 8= 20

20+ 10= 30

30+ 12= 42

42+ 14= 56

56+ 16= 72

72+ 18= 90

90+ 20= 110

110+ 22= 132

132+ 24= 168

That's now 182- 168= $14

So there are those 11 payments and a twelfth payment of $14. - Jan 25th 2013, 11:15 AMearthboyRe: 6th grade math help
- Jan 25th 2013, 07:33 PMGNUF3Re: 6th grade math help
Thanks all for your help!

- Jan 26th 2013, 02:26 AMGreenAziboRe: 6th grade math help
There are help tips on gwl10925's profile and a good book for 6th grade at 6th Grade Math by Jessica Corriere Robert Richards (Paperback) - Lulu