Write the expression as the sine, cosine, or tangent of an angle.
A. tan 54
B. tan 81°
C. tan 40.5°
D. tan 45°
Answer: D
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Find the area of the surface generated by revolving the curve about the indicated axis. x = 3
, 0 ? y ? 15/4; y-axis
A. 5?
B. 
?
C. 
?
D. 
?
Find the unknown length in the right triangle. If necessary, round to the nearest tenth.
A. 17.5 in. B. 11.5 in. C. 152.5 in. D. 305 in.
If A denotes the area of the sector of a circle of radius r formed by the central angle ?, find the missing quantity. If necessary, round the answer to two decimal places.r = 10 inches, ? = 2 radians, A = ?
A. 10 in2 B. 200 in2 C. 20 in2 D. 100 in2
Indicate to which set(s) the number belongs from the following choices: natural numbers, whole numbers, integers, rational numbers, irrational numbers, and real numbers. The numbers may belong to more than one set.- 
A. irrational numbers, real numbers B. integers, real numbers C. real numbers D. rational numbers, real numbers