Question

Find the sum of the first 4 terms in the series.

Answer 1

175

Explanation:

If the first term is 64 and the common ratio is 0.75, then

a(n) = 64*0.75^(n - 1).

Thus, a(2) = 64*(0.75)^(2-1) = 64*(0.75) = 48, and

a(3) = 36, and

a(4) = 27

The sum of the first 4 terms is 64 + 48 + 36 + 27 = 175