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

There are 30 cans of soda in the refrigerator. The table shows how many cans there are of each type. If you reach in and pull out one can of soda, what is the p

Which atom has the strongest attraction for valence electrons a) Al b) Si c) P d) S

a certain reaction has delta h= -75 kj mol and an activation energyh What is the activation energy of the reverse reaction?

Simplify the following expression as much as possible. csc^2 x * sin^2([tex]\pi[/tex]/2 - x)/ cot^2 x

What is the solution set of the following system of equations? y=3x+6 y=(x+4)^(2)-10 The solution tothe system is at (-5,-9). The solutjon to the system is at (

What takes the most impact of any part of the body? O Feet O Wrists O Hamstrings O Knees

You buy hats for $20, and sell them for $5 each. What does the graph of the profits look like? A: A curve that goes up B: A line that goes down C: A curve that

If you use the eight digits 1,2,3,4,5,6,7 and 9 each once and ONLY once to form 4 two-digit prime numbers. What will be the sum of the four prime numbers you cr

There are 30 cans of soda in the refrigerator. The table shows how many cans there are of each type. If you reach in and pull out one can of soda, what is the p

21 shirts = $147 and 22 shirts =$154 and 23 shirts = $161 then how much does 30 shirts cost and how much does 9 shirts cost to