Friday

April 18, 2014

April 18, 2014

Posted by **dan** on Wednesday, June 13, 2012 at 1:44pm.

4 + 9 + 14 + 19 + …….94 + 99 + 104

- math -
**Reiny**, Wednesday, June 13, 2012 at 2:25pmfirst you have to know how many terms you have

what term is 104

a + (n-1)d = term(n)

4 + (n-1)(5) = 104

5n - 5 = 100

5n = 105

n = 21

now sum(21) = (first + last)(21/2)

=(4+104)(21/2) = 1134

**Related Questions**

maths - 1) The first term of arithmetic progression is -20 and the sum of it's ...

AP Calculus - The 9th term of an arithmetic progression is 4+5p and the sum of ...

Math - A sequence is called an arithmetic progression of the rst order if the di...

Math (Geometric Progression) - 5 distinct positive reals form an arithmetic ...

Math - 5 distinct positive reals form an arithmetic progression. The 1st, 2nd ...

Maths - 1..The first 2 terms of a geometric progression are the same as the ...

math - There are two positive numbers that can be inserted between 3 and 9 such ...

AP calculus - Given an arithmetic progression -7,-3,1,..., state three ...

arithmetic - Find the sum of the 25th term to 50th term of the arithmetic ...

arithmetic - In an arithmetic progression the sum of the first 10 terms is 50 ...