PLEASE PLEASE PLEASE HELP!!!

Jackie deposited $5 into a checking account in February. For each month following, the deposit
amount was doubled. How much money was deposited in the checking account in the month of
August?

Question

PLEASE PLEASE PLEASE HELP!!!

Jackie deposited $5 into a checking account in February. For each month following, the deposit 
amount was doubled. How much money was deposited in the checking account in the month of 
August?

anonymous · Answer

determine whether the problem should be solved using the formula for an arithmetic sequence, arithmetic series, geometric sequence, or geometric series. Explain your answer in complete sentences. You do not need to solve.

anonymous · Answer

it is a geometric sequence but  can somebody just explain why?