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

PLEASE HELP ME, I REALLY NEED HELP

Why can light microscopes produce images in their natural color, while scanning electron and transmission electron microscopes only produce grayscale images?

2m divided by 3/9; m = 3/2

What is the slope of the line represented by the values in the table? X: 10 2 3 7 20 Y: 14 -2 0 8 34

What is it called when a rock is broken down into smaller pieces by ice, glacier or water ? Chemical weathering, physical weathering, deposition, pollution

matching thingy helppp!!

in the diagram triangle ABC is congruent to triangle w r s what is the perimeter of triangle w r s

How would you write 1 1/10 as a percent?

(True or False) Only four different building blocks of DNA, called nitrogen bases, give all organisms the physical characteristics they have.

Complete the sentence using the word lava, magma, or metamorphic rock