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A delivery driver makes $51 each day that he works and makes approximately $7 in tips for each delivery that he makes. If he wants to make at least $219 in one day, at least how many deliveries does he need to make?

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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.

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