5. Lilly needs at least $400 to buy a phone. Her mom gave her $60 and she earns $10 a day babysitting her little sister. How many days to reach goal? Write and solve the inequality.

Answer 1

Let d be the number of days it takes for Lilly to reach her goal.
Since she earns $10 a day babysitting her sister, she will earn 10*d dollars.
Since her mom gave her $60, she has a total of 10*d + 60 dollars.
She needs at least $400 to buy a phone, so the inequality is:
10*d + 60 >= 400
Subtract 60 from both sides:
10*d >= 340
Divide both sides by 10:
d >= 34
Lilly needs at least 34 days to reach her goal.