Please help! I will mark as brainliest. <3

Answer(s):
1. $5000
2. 100x
3a. at least
3b. 9 meals
My shown work:
1. $100 per meal. Monthly expenses are $3100.
50 meal [$100 x 50 = x]
x = $5000
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2. x = number of meals sold
Inequality (y=mx+b)
Giving me: 900 = 100x
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100 x 9 = 900