Robinscottbateman Robinscottbateman
  • 01-03-2018
  • Mathematics
contestada

Which is a possible expression for the series
–7 + 12 –17 +22 –27

Respuesta :

carlosego
carlosego carlosego
  • 01-03-2018
First, you have to see the behavior of the series: it has a negative number, then a positive number with a 5 addd (7+5=12), and this is repeated with the others values. Each termn has a 5 added. In this case, as there is negatives values alternated, the serie will have the termn (-1)^n. Then, we have:
 
 a(n)=(-1)^n[ a + (n-1)d ]
 a(n)=(-1)^n[ (7) + (n-1)(5) ]
 a(n)=(-1)^n( 5n + 2 )
 
 A possible expression for the serie –7 + 12 –17 +22 –27, is:
 
 ∑5n=(−1)^n(2+5n)
Answer Link

Otras preguntas

Einstein's theory of general relativity was published in 1916. It became fully accepted by scientists in the 1960s and is currently the best explanation of grav
hii can someone help me with this motion question please
Find the quotient of 6a³ ÷ 3a.
Hi guys Does anyone have an answer to these?
True or False: On the least-squares regression line, the point (x,y) always has a residual of 0. True False
Why do we need to send emails
2) What distance does the car take slowing down from 25 m/s if it has a deceleration rate of 5 m/s for 5 seconds?
A race track is made from two straights and two semicircles. The straights are 80m long. The race track has a total perimeter of 400m. Calculate the distance,d,
Anyone can write???????
List some of the differences between the confederation political system under the Articles of Confederation and the federation political system under the US Con