Use the half-angle formulas to evaluate the given function.cos 22.5°
A. 0.9238
B. 0.5412
C. 0.9808
D. 0.3827
Answer: A
Mathematics
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Evaluate the expression, if possible.
A. 4 B. not a real number C. -64 D. -4
Mathematics
Graph the inequality on the number line.x < 
A. 
B. 
C. 
D. 
Mathematics
Solve.A rotating beacon is located a distance d from a long wall. The distance d is given by 
, where t is the time measured in seconds since the beacon started rotating. Solve the equation for t.
A. t = 
arctan 
B. t = 2? arctan 
C. t = 2? tan 
D. t = 
tan 
Mathematics
Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.2.5x - 2.4y + 1.9z = 3.33.9x - 7.0y + 0.3z = -2.74.1x - 3.2y + 5.7z = 2.5
A. (7.3, 4.3, -2.4) B. (3.6, 2.2, -1.2) C. (1.8, 1.1, -0.6) D. (5.5, 3.3, -1.8)
Mathematics