Tuesday

November 25, 2014

November 25, 2014

Posted by **sonia** on Tuesday, November 2, 2010 at 10:48am.

- math -
**Reiny**, Tuesday, November 2, 2010 at 1:10pmarithmetic series

a = 200

d = 50

Sum(n) = (n/2)[2a + (n-1)d]

13500 = n/2 [400 + 50(n-1)]

27000 = n(50n + 350)

50n^2 + 350n - 27000 = 0

10n^2 + 7n - 5400 = 0

n = ..... One answer will be + , the other -, reject the -

**Answer this Question**

**Related Questions**

Math - If a salesman sold 2 cars in his first month, 8 cars in his second month...

math - Xuan saved $5340 in 3 years. If he saved $95 per month in the first year ...

Algebra - After one month at a new job you decide to save $50. Each month you ...

Algebra 2 - After one month at a new job you decide to save $50. Each month you ...

Algebra - You earn $250 per month from your part-time job. You are in a kayaking...

Algebra - Monthly Budget: You earn $250 per month from your part-time job. You ...

math - Gloria talked on her cell phone for 320 minutes the first month, 243 ...

math - Gloria talked on her cell phone for 320 minutes the first month, 243 ...

math - Steri-strips cost $4.95 per box, there are 100 per box. If an orthopedic ...

consumer math - You owe $1,350.00 on a credit card with a 14.25% APR. You pay $...