BreBreDoeCCx
BreBreDoeCCx BreBreDoeCCx
  • 04-03-2018
  • Mathematics
contestada

Find S10 for (-1) + (-7) + (-13) + (-19) +...

A.
250

B.
-280

C.
(-23)

D.
132

Respuesta :

Banabanana
Banabanana Banabanana
  • 04-03-2018
[tex]a_1=-1 \\ a_2=-7 \\ \\ d=a_2-a_1=-7-(-1)=-6 \\ \\ \\ S_{10}= \cfrac{2(-1)+(10-1)(-6)}{2}\cdot10 = \cfrac{-2-54}{2}\cdot10 =\cfrac{-56}{2}\cdot10 =-280[/tex]

Your answer is B.-280
Answer Link

Otras preguntas

1. Arc QR = Arc RS = 2. Find x and y -- if your answer is not a whole number, round to the tenths!
What is 4.5 repeating as a fraction?
Help with is ixl please
What is 4.5 repeating as a fraction?
Plot the point on this function with an x-value of 6. What is the y-value of this point?
A circle with a radius of 5 is transformed into the following function: (x/3)² + (5y)² = 25 What percentage of the original circle's area is the area of the new
Five times a number decreased by 2 is 4, find the number.
1. Arc QR = Arc RS = 2. Find x and y -- if your answer is not a whole number, round to the tenths!
Five times a number decreased by 2 is 4, find the number.
a and b are vectors that are not parallel. FG = 2a − 3b - Choose all of the vectors below which are parallel to FG. a-b10a-15 3a-2b-4a+6b 2a + 3b 2a-3b-4a 2a-12