Mr. and Mrs. Miller both get in their cars and begin to drive at the same time. Mr. Miller is 280 mi from their house and drives directly home at a constant rate of 40 mph. Mrs. Miller is at their house and drives away from the house at a constant rate of 30 mph.
Let d represent distance from home, and let t represent time in hours.
Which system models this situation?
a. d = 280 + 40t
d = 30t
b. d = 280 - 30t
d = 40t
c. d = 280 - 40t
d = 30t
d. d = 280 - 40t
d = 280 + 30t
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