Find s7 for the geometric series 2 + -6 + 18 + -54 +…

  1094

Step-by-step explanation:

The sum of terms of a geometric series is given by ...

  Sn = a1·(r^n -1)/(r -1)

You want the sum for ...

  a1 = 2, r = -3, n = 7

Filling in the numbers, we get ...

  S7 = 2·((-3)^7 -1)/(-3-1) = 2(-2188)/(-4)

  S7 = 1094

a

step-by-step explanation:

when a number is between two straight lines it means the absolute value.

to find absolute value you need to know how many numbers is that number away from 0.

when finding absolute value the number will always come out positive

so absolute value of -3 is 3

absolute value of 3/2 is 3/2

absolute value of -2 is 2

absolute value of 3.5 is 3.5

absolute value of -1 is 1

now put these numbers in order:

a)   |-1|, |3/2|, |-2|, |-3|, |3.5|