# Math

A friend opens a savings account by depositing \$1000. He deposits an additional \$75 into the account each month.
a. What is a rule that represents the amount of money in the account as an arithmetic sequence?
b. How much money is in the account after 18 months? Show your work.

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1. a. this is a arithmetic series, not a sequence. the Sum of the series is given by months m is

sum=m/2 * (2*1000 + (m-1)75)

for 18 months, put m=18 and compute.

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