makingachange2 makingachange2

22-01-2022
Mathematics

contestada

Determine the sum of the first 20 terms of an arithmetic sequence in which first
terms is 31 and the twentieth term is 109

Respuesta :

sqdancefan sqdancefan

22-01-2022

Answer:

1400

Step-by-step explanation:

The average term is the average of the first and last terms.

average term = (31 +109)/2 = 70

The sum of the 20 term is 20 times the value of the average term:

S20 = 20(70) = 1400

Answer Link

Otras preguntas

how much did it cost to manufacture a Mig-21 Fishbed fighter jet.

0.6x-0.3y=-1.50.04x-0.02y=-0.1

What is the difference between an isthmus and a strait?A.A strait is a body of land that creates a bridge over a large body of water, and an isthmus is the plac

why does the plasma cell have a well developed endoplasmic reticulum with lots of ribosomes

How did the achievements of the Scientific Revolution contribute to the Enlightenment ?

In the mid 1800s, much of the South remained agricultural rather then moving toward manufacturing. Many farmers relied on cotton as their main crop. Which of th

Solve the given polynomial equation. Use the Rational Zero Theorem and Descarte's Rule of Signs as an aid in obtaining the first root.6x^3-7x^2-6x-1=0What is th

Optimization- Of all rectangles with a perimeter of 10, which one has the maximum area? (Give dimensions)

What is the answer to this equation 50X6-?=265/ I assume it is poitive 35. Is that correct?

How many atoms lie in a straight line in the molecule 2-butyne, CH₃C≡CCH₃? a. 10 b. 8 c. 6 d. 4 e. 2