Decide whether the expression is or is not an identity.cos 
tan 
= 
A. Not an identity
B. Identity
Answer: B
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Set up the general equation from the given statement.The illumination I produced on a surface by a source of light varies directly as the candlepower c of the source and inversely as the square of the distance d between the source and the surface.
A. I = 
B. I = 
C. I = 
D. I = 
Solve the problem.The half-life of plutonium-234 is 9 hours. If 20 milligrams is present now, how much will be present in 4 days? Round your answer to three decimal places.
A. 0.918 mg B. 0.012 mg C. 9.548 mg D. 14.697 mg
Solve the equation in the interval [0°, 360°). Give solutions to the nearest tenth, if necessary.2 cos2? + 7 sin ? = 5
A. {30°, 210°} B. ? C. {30°, 330°} D. {90°, 48.6°, 131.4°}
If possible, evaluate the expression by hand. If not, approximate the answer to the nearest hundredth. Variables represent any real number.
A. 12 B. 8 C. 6 D. 1296