Question

VERY IMPORTANT!! PLEASE HELPPP :(

Answer 1

7

Explanation:

Sigma notation means that you will add and continue adding using the function given. Furthermore, bottom number i = 1 is your starting point and the top number 3 is where you will stop the summation. So,

Let i = 1:

`4((1)/(2)^(1-1))=4(1)=4`

Let i = 2

`4((1)/(2)^(2-1))=4((1)/(2))=(4)/(2)=2`

Let i = 3

`4((1)/(2)^(3-1))= 4(((1)/(2))^2 )=4(1)/(4)=(4)/(4)=1`

And so let's add up our results:

4+2+1=7