Each week you deposit money in a savings account. The first week you deposit $6 in the account. Each week you deposit $5 more than you deposited the week before. How much do you save after 15 weeks?

81

Step-by-step explanation:

The first week isnt subject to change so add a contstant 6 dollars

The 5 is subject to time in weeks of x

6 + 5(x) = f(x)

So if we plug in 15 for x we get

6+5(15) = 81 dollars saved