Final answer:
Keith can withdraw money from his account for 12 weeks.
Step-by-step explanation:
To determine how many weeks Keith can withdraw money from his account, we need to calculate the total amount of money he can withdraw. Keith wants to have at least $350 in his account by the end of summer. He currently has $708 in his account. Therefore, the total amount he can withdraw is $708 - $350 = $358.
Keith withdraws $28 each week. To find out how many weeks he can withdraw money, we can divide the total amount he can withdraw ($358) by the amount he withdraws each week ($28). $358 / $28 = 12.79.
Since we can't have a fraction of a week, Keith can withdraw money for 12 weeks.