Answer: 4 days, more below
Explanation:
40.50x + 0.15y < 210
(0.15)(125)=18.75
40.50x + 18.75 < 210
40.50x < 191.25
x < 4.7222222...
She can afford to rent the car for 4 days if she drives 125 miles and has 210$ to spend.
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