On Dolores's tenth birthday her grandfather deposited $35 in a savings account for her. Each year, her grandfather
deposited twice the amount of the previous year's deposit.
How much money did her grandfather deposit on Dolores's
eighteenth birthday?

Her grandfather deposited $4480 on Dolores's  eighteenth birthday.

Step-by-step explanation:

Initial amount deposited = $35 (on tenth birthday)

Amount deposited after a year  = 2 x ($35)  (on eleventh birthday)

Amount deposited after 2 years  =2 x( 2 x ($35))  = 2²(35)(on eleventh birthday)

It is following the geometric progression, where a= 35, r= 2 (common ratio)

nth term in GP =

Amount deposited on eighteenth birthday (i.e. n=8) =

Hence, Her grandfather deposited $4480 on Dolores's  eighteenth birthday.

step-by-step explanation: