Question

In a geometric sequence each term is positive, the first term is 4 and the third term is 9.

What is the sum of the first four terms?

Answer 1

Answer:

4 _____ 9

the geometric sequence is the addition of 2.5 to every number until the specific amount you are to get

4+2.5=6.5 that is the second term

if I then add 2.5 to 6.5it will give me 9 which is the third term but we are asked to find the sum of the first 4terms so 9+2.5=11.5

if we are to add 4,6.5,9 and 11.5 it would give me =31 which is the final answer.

hope this helps.