Solve the problem.The minimum length L of a highway sag curve can be computed by L = 
,where ?1 is the downhill grade in degrees (?1< 0°), ?2 is the uphill grade in degrees (?2> 0°), S is the safe stopping distance for a given speed limit, h is the height of the headlights, and ? is the alignment of the headlights in degrees. Compute L for a 55-mph speed limit, where 
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and 
Round your answer to the nearest foot.
A. 601 ft
B. 634 ft
C. 651 ft
D. 617 ft
Answer: D
Mathematics
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?
?
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Mathematics