Answer:
b
Step-by-step explanation:
So let's start out by labeling Ethan as X
Since 85 is 1/3 of what Ethan drove, that means Ethan drove 3 times of 85.
85= (3x) -21
85 -21 = 3x
60=3x
20 = x
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Answer:
C. c(t) = 21 + 12t
Step-by-step explanation: