Tuesday
September 30, 2014

Homework Help: Precalculus

Posted by Laura on Saturday, June 16, 2007 at 8:17am.

Find the sum of 20 (summation notation symbol)k=1 then (3k-5)

If you mean the sum of the first 20 terms, beginning with k=1, of
ak = 3k - 5,
that would be -20 x 5 = -100
PLUS the sum of the first 20 terms of
ak = 3k
The latter is 3 times the sum of
1+2+3+...20 ,
or 3*(20)(21)/2= 630
So the answer is 630 - 100 = 530

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Precalculus - Find the sum of the first 50 terms of the sequence 2,4,6,8...
arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...
arithmetic - 1. The first and last term of an A.P are, a and l respectively, ...
Further mathematics - An exponential sequence (GP)of positive terms and a linear...
Algebra - Express the sum below using summation notation. Use 1 as the lower ...
Algebra - I have a few problems I need some help with. The first is Evaluate ...
Geometric - 1) The sum of last three terms of GP having n terms is 1024 time the...
calc help - consider the function f(x)= x^2/4 -6 Rn is the Riemann sum where the...
Math - Sum of4th and the 6th terms of an a,p is 42 . While the sum of the 3rd ...
Further mathematics - An exponential sequence of positive terms and a linear ...

Search
Members