Tuesday

September 2, 2014

September 2, 2014

Posted by **Neil** on Tuesday, May 29, 2012 at 8:40pm.

(Sigma Sign) 2n + 7

k= 1

- Math -
**MathMate**, Tuesday, May 29, 2012 at 8:51pm∑2n+7

=2∑n + ∑ 7

=2*(20+1)(20/2) + 20*7

=420+140

=560

- Math -
**Neil**, Tuesday, May 29, 2012 at 8:53pmThank you, MathMate.

- Math -
**Neil**, Tuesday, May 29, 2012 at 8:59pmWait, do you know how it could be plugged into the Sn= a1 (1 - r^n/ 1 - r) formula?

- Math -
**MathMate**, Tuesday, May 29, 2012 at 10:22pmSn= a1 (1 - r^n/ 1 - r)

applies when the series is a geometric progression, such as

20

∑ a1*r^i

i=1

**Answer this Question**

**Related Questions**

Algebra - find the indicated sum not sure how to type the sigma sign, but here ...

MATH !! - n lim(n→+∞) ∑ (3/4)^k = k=1 the n is supposed...

Algebra II - Please help-I need to write 4+6+8+10 in sigma notation would it be ...

math - I just need help with this. Write the series in sigma notation. 1/4 + 1/2...

math - I just need help with this. Write the series in sigma notation. 1/4 + 1/2...

further mathematics - The roots of the eqn, x^4 + px^3 + qx^2 + rx + s = 0 where...

Pre-Calc-Please check answer - 1.Write 4+6+8+10 in sigma notation: I came up ...

Pre-Calc-Please check answer - 1.Write 4+6+8+10 in sigma notation: I came up ...

Math - Find the sum of the arithmetic series. 20 (Sigma Sign) 2n + 7 x= 1 ...

Physics - [b]1. The problem statement, all variables and given/known data[/b] A ...