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 = 2? tan 
B. t = 
tan 
C. t = 2? arctan 
D. t = 
arctan 
Answer: D
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In a statistics class, 12 students have brown color eyes, 4 have blue eyes, 8 have hazel, and 2 green. What is the median for this set of data?
A. brown B. 6.5 C. 10 D. none
Apply the Quotient Rule and simplify the expression. Write the result with positive exponents only.
A. c10
B. 
C. 
D. 
Solve.Find the equilibrium point for the given supply and demand functions. Here y represents price and x represents quantity. y = 456 - 3x (demand) y = 3x - 300 (supply)
A. 453, $303 B. 126, $78 C. 78, $126 D. -300, $456
An object attached to a coiled spring is pulled down a distance a from its rest position and then released. Assuming that the motion is simple harmonic with period T, write an equation that relates the displacement d of the object from its rest position after t seconds. Also assume that the positive direction of the motion is up.a = 5;
T = 10 seconds
A. d = 5 cos (10t)
B. d = -5 cos (10t)
C. d = -5 cos 
D. d = 5 cos 