A pipe has a 4.05-in. outside diameter and a 3.8-in. inside diameter. (See the illustration.) Find the area of its cross section. Use the rules for working with measurements.
A. The area is 0.785 in 2.
B. The area is 3.08 in 2.
C. The area is 0.771 in 2.
D. The area is 6.17 in 2.
E. The area is 1.54 in 2.
Answer: E
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Use a half-angle identity to find an exact value for the following, given the information about x. Find tan 
, given that cos x = - 
and x terminates in 180° < x < 270°.
A. - 
B. 
C. - 
D. 
Multiply. Then simplify if possible. Assume that all variables represent positive values.
? 
A. 5x
B. 15x2
C. 15
D. 15x
Determine whether the following is true or false.n(A ? B) ? n(A) + n(B) - n(A ? B)
A. True B. False
Solve the problem.The mathematical model 
represents the cost in dollars a company has in producing x items during a month. Based on this, how much does it cost to produce 
? Interpret the question and answer using function notation.
A. $320,000; f(320,000) = 800 B. $360,000; f(800) = 360,000 C. $360,000; f(360,000) = 800 D. $320,000; f(800) = 320,000