A car company tested a sports car on a road with different inclines. The test driver tested the car by driving a distance of x miles on a flat road, (x2 + 3) miles downhill, and (x - 7) miles uphill. Which simplified expression is equivalent to the total distance, in miles, for which the car was tested?
3x2 _ 4
3x2 + 10
x2 + 2x - 4
x2 + 2x + 10
I suck at word problems
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