Solve the problem. Suppose a student plans to drive from his home to New Haven 75 miles on a divided highway and 30 miles on an undivided highway. The speed limit is 70 mph on the divided highway and 50 mph on the undivided highway. Assume the driver drives nonstop. Let T(a) represent the driving time (in hours) if the student drives at a mph above the speed limits. By finding a formula for T(a), determine by how much the student would need to exceed the speed limits to get to New Haven in 1.5 hours.
A. 7.0 mph
B. 9.1 mph
C. 7.7 mph
D. 8.5 mph
Answer: A
Mathematics
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A. 
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C. 
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Perform the operation indicated. Simplify.
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C. 
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