kittybiancacardenas kittybiancacardenas
  • 22-06-2020
  • Mathematics
contestada

Find the sum of the first 31 terms of the following series, to the nearest integer. 5 , 14 , 23 , . . .

Respuesta :

devishri1977
devishri1977 devishri1977
  • 23-06-2020

Answer:

Step-by-step explanation:

a1 = 5

common difference = 2nd term - 1st term= 14 -5 = 9

n = 31

[tex]S_{n}=\frac{n}{2}[2a+(n-1)d]\\\\S_{31}=\frac{31}{2}[2*5+30*9]\\\\=\frac{31}{2}[10+270]\\\\=\frac{31}{2}*280\\\\=31*140\\\\=4340[/tex]

Answer Link

Otras preguntas

Maximum or Minimum. Domain and range of y=x^2-4x+4
the problem says find equivalent expressions that have the LCD picture of problem below
How did Great Britain threaten manifest destiny
A rectangular room is 6 yards long an 12 feet wide.  Find the perimeter in feet.  Then find the perimeter in yards.
What is 423.408 rounded to the neatest hundredth
what did queen isabella have to overcome in her life
Why did William Pitt The Younger introduce the Reign of Terror?
if average of m numbers is n^2 and average of n numbers is m^2 then average of m+n numbers is
How would I solve these? (-3xy)³ (-x³)and(-9b²a³)² (3³b)²
Sophina brought 3 yards of trim to put around a rectangular scarf. She does  not want the scarf to be wider than 12 inches or narrower than 6 inches .Using whol