Simplify. 
A. 
B. 
C. 
D. 
Answer: C
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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
Factor completely. If the polynomial is prime, state this.x4 - 24x2 - 25
A. (x + 1)(x - 1)(x + 5)(x - 5) B. (x2 + 1)(x2 - 25) C. (x2 + 1)(x + 5)(x - 5) D. (x2 + 25)(x + 1)(x - 1)
Simplify.7
+ 5
A. 47
B. 51
C. 96
D. 100
For problems 7-9 each of the sequences is arithmetic. Find the formula for the nth term. The 12th term is 156. The common difference is 12.
A. 
B. 
C. 
D. 
E. None of these