Question

Can someone help me with this?

Answer 1

7

Explanation:

Calculate and sum up the first three terms.

We get:

4[ (1/2)^(1-1) + (1/2)^(2-1) + (1/2)^(3 - 1) ], OR

4[ 1 + (1/2) + (1/2)^2 ], or

4[1 + 1/2 + 1/4} = 4[7/4] = 7