BreBreDoeCCx BreBreDoeCCx

04-03-2018
Mathematics

contestada

Find S25 for (-7) + (-2) + 3 + 8 +...

A.
1,320

B.
1,325

C.
825

D.
820

Respuesta :

Banabanana Banabanana

04-03-2018

[tex]a_1=-7 \\ a_2=-2 \\ \\ d=a_2-a_1=-2-(-7)=5 \\ \\ \\ S_{25}= \cfrac{2(-7)+(25-1)5}{2}\cdot25 = \cfrac{-14+120}{2}\cdot25 =\cfrac{106}{2}\cdot25 =1325[/tex]

Your answer is B. 1325

Answer Link

Otras preguntas

3(x - 4) + 8(x + 2).

10 people can paint a building in 5 days. If each person paints as quickly as the others then how much of the building could 7 people paint in 5 days?

Why are there so many blood vessels under the frog skin?

The natural pH of rain water is?

Rachel is 2 miles northwest of her house. If she begins walking south at a rate of 3 miles per hour, which set of parametric equations will give her position re

1.what is the mode of the set 2. What is the range of the set 3. Whose height is closest to the median height for the set 4.whose height is closest to the mean

half of earths species are in what type of biome

what is the value of y

Match each group from the russian revolution with its description

What is the correct classification of 72 + 9 + 4?