Set up a cost function C(m), where m is the number of miles Erica can travel. We have:
C(m) = 0.65m + 1.75
If C(m) = 10, we have:
0.65m + 1.75 = 10
Typing this equation into our search engine, we get:
m = 12.69 miles
If the problem asks for complete miles, we round down to 12 miles.
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