Lily is saving up to buy a cell phone. She needs to save at least $300 before she is able to buy the phone. Her grandfather gives her $40 and she earns $65 tutoring after school each week. Write an inequality to the number of weeks. Lily will need to save to have at least $300.
Let x be the number of weeks Lily needs to save.
The amount of money Lily earns after x weeks is 65x.
The total amount of money Lily has, including her grandfather's gift, is $40 + $65x.
According to the problem, she needs at least $300, so the inequality can be written as:
$40 + $65x ≥ $300