Amy has $1,000 in a savings account at the beginning of the fall. she wants to have at least $500 in the account by the end of the fall. she withdraws $100 a week for living expenses. write an inequality for the number of weeks amy can withdraw money, and solve. a)1000 - 100w ≤ 500; w ≥ 6b)1000 + 100w ≤ 500; w ≤ 5c)1000 + 100w ≥ 500; w ≥ 6d)1000 - 100w ≥ 500; w ≤ 5

ANSWER:
D) 1000 - 100w  500; w  5

WHY NOT A?
Well, choice a says that you can have less than or equal to $500 (), but she wants $500 or more. Additionally, she can only do it for 5 weeks,  but the equation says 6 weeks (w).

WHY NOT B?
This choice says that she will be adding $100 a week (+100w), when the problem states, "She withdraws $100 a week". 

WHY NOT C?
This choice says that she will be adding $100 a week (+100w), when the problem states, "She withdraws $100 a week". Also, this question says that she will do it for 6 weeks when she can only do it for 5 weeks or less.