snp5kc4xxt snp5kc4xxt

03-06-2021
Mathematics

contestada

Find the sum of the first 30 terms for the given arithmetic sequence.
8, 1, -6, -13,...
-3107
-2805
-1705
-2508

Respuesta :

jcherry99 jcherry99

03-06-2021

Answer:

Step-by-step explanation:

Find the last term of the sequence.

a1 = 8

d = -7

n = 30

a30 = 8 + (n - 1)*(-7)

a30 = 8 + (30 - 1)*-7

a30 = 8 + 29*-7

a30 = 8 - 203

a30 = -195

Sum = (a + L)*n/2

Sum = (8 + -195) * 30/2

Sum = - 187 * 15

Sum = - 2805

Answer Link

Otras preguntas

inverse equation x-19 = -23

Solve this question for BRAINLIEST!

does anyone know any compliment you can give someone? example: hardworking , determined , successful please do not use nice , pretty , cute , cool or somethin

another name for exponential growth?

Find the measure of angle ACB

A strong thesis needs toA. have at least one item of evidence to support itB. include some of the wording from the promptC. include a direct quotation from the

If you experience stress when making a decision, what should you do? A. Refuse to make the decision because it provides too much stress. B. Use stress managem

Help me please!! Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar. The measurement of angle B is ____

What kind of economic system does Russia have? A. Free Enterprise SystemB. Socialist C. Communist or Command EconomyD. Traditional Economy

A circle has a radius of 4in what is the area of the circle?