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

If you know the answer please answer asap when you see this please thanks you, ya know

can someone draw this oc of mine? i'd greatly appreciate it, thanks!

what is the change between 4 and -3

What might happen if we couldn’t feel pain? (please please help I have to turn this assignment in soon)

2 minutes talk about experience of traveling (any country)

what are the reasons for the development of the most of the old human civilization is on the bank of river

Determine if the lines are perpendicular

The data below show the number of cakes made and hours for two people. Which is the higher cakes per day rate of the two people below? Cody Dean 90 y = 14x 60

find the median of the following 80 82 84 86 88 90 92

Determine whether the graphs of the given equations are perpendicular 3x + 5y = 10 5x – 3y = -6