Lily is saving up to buy a cellphone. 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 for the number of weeks Lily will need to save to have at least $300, and describe the solutions.
__x+ __ ≥__, where x is the number of weeks Lily will need to save. Lily must save for at least __ weeks to have at least $300.
65x + 40 ≥ 300
x ≥ (300-40)/65
x ≥ 4.615
The solutions for the inequality are x ≥ 4.615, which means Lily must save for at least 4.615 weeks (approximately 5 weeks) to have at least $300.