Simplify.-|13|
A. 13
B. - 
C. 0
D. -13
Answer: D
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Find the second derivative of the function.r = 
(9 - ?)
A. 
= 
- ?
B. 
= 
C. 
= - 
- 1
D. 
= - 
- 1
Find a minimum spanning tree for the graph.
A. 
B. 
C. 
D. 
Find the distance from P1 to P2.P1 = (0, 0, 0) and P2 = (-2, -4, 2)
A. 2
B. 3
C. 
D. 2
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. 846 ft
B. 869 ft
C. 824 ft
D. 893 ft