Use the half-angle formulas to simplify the expression.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Answer: A
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Solve the inequality and graph the solution set.12x - 8 < 4x or -2x ? -6
A. 
B. ?
C. 
D. 
Middletown is designing a new high-speed rail system to connect Downtown, the Airport, and the Mall. The elevated tracks for the rail system will run along the existing roads, that run on a grid as shown below. In addition, a central switching station must be located at one of the intersections.
What is the length of the optimal network?
A. 7 blocks
B. 8 blocks
C. 5 + 
blocks
D. 9 blocks
E. none of these
Simplify the following by combining like terms.2x7 + 6x3 + 5x7
A. 13x17 B. 7x7 + 6x3 C. 13x3 D. cannot be simplified
Find the standard form of the equation of a circle that satisfies the given conditions.Center (24, 12) and touches the x-axis
A. (x - 24)2 + (y - 12)2 = 576 B. (x - 24)2 + (y - 12)2 = 144 C. (x - 12)2 + (y - 24)2 = 576 D. (x - 12)2 + (y - 24)2 = 12