Final answer:
To earn at least $219 in one day, the delivery driver needs to make at least 24 deliveries.
Step-by-step explanation:
To find out how many deliveries the driver needs to make to earn at least $219 in one day, we can set up an inequality. Let's assume he makes x deliveries. His earnings from the deliveries would be 7x (since he makes approximately $7 in tips for each delivery). His earnings from working would be $51. So, we can write the inequality as: 7x + 51 ≥ 219. Now we can solve for x:
7x ≥ 219 - 51
7x ≥ 168
x ≥ 168 ÷ 7
x ≥ 24
Therefore, the driver needs to make at least 24 deliveries to earn $219 or more in one day.