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

the United States Constitution delegates police power mainly to

how many wars did edward I win

In which order were these documents written and adopted? 1. U.S. Constitution 2. Bill of Rights 3. Declaration of Independence 4. Articles of Confederation A.

How often is water added to the Earth system?

A coat that originally sold for $369.00 is on sale at a 40% discount? How much will you pay for the coat?

Take a look at the statement below: Fish meal is better than artificial fertilizers. How could this statement be revised to make it a hypothesis?

what should an operator do when attempting to re-board a personal watercraft (PWC)?

The ocean contains many plants and protists that can make their own food. What do these organisms get by living near the surface that they cannot get in deep wa

what is 0.09 1/10 of what is 0.04 1/10 of what is 0.6 1/10 of what is 0.1 1/10 of

what is the value of the expression? 4^3 • 4 ^−5 A. 4^−15 B. 4^−2 C. 4^2 D. 4^8 i thought it was d. but im not sure what to do to solve -_- PLEASE HELP!!