Answer:
5
Explanation:
The amount of money in the savings account can be modeled as ...
64.96 +69.80n
where n is the number of deposited checks. We want this value to be at least 400, so we must solve ...
64.96 +69.80n ≥ 400
69.80n ≥ 335.04
n ≥ 335.04/69.80
n ≥ 4.8
You must deposit 5 paychecks to reach your goal.