The advantage of using exponential notation is that you won't have to keep writing a long number
For example, 40,000,000,000,000 would be tedious to write over again, but using exponential notation that number would be just 4 X 10^13.
Answer:

Step-by-step explanation:
From the question we are told that:
9th term 
14th term 
Generally the equation for Geometric sequence is mathematically given by

For 9th term

For 14th term

Substitute in 9th term




Therefore First term a is given as


Generally the equation for the 18th term is mathematically given by



I would go B because it makes the most sense he wants a Random group
(5460.4)(3/8) = 2,047.65 to savings
5460.4 - 2,047.65 = 3,412.75 checking