Use the cofunction and reciprocal identities to answer the question.csc 81° = sec _____ = 
A. 9°, sec
B. 171°, cos
C. 9°, sin
D. 9°, cos
Answer: C
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Evaluate the expression.3-2
A. -9
B. 9
C. 
D. 
Solve the problem.The gravitational force (in lb) of attraction between two objects is given by 
where x is the distance between the objects. If the objects are 15 ft apart, find the work required to separate them until they are 50 ft apart. Express the result in terms of k.
A. 
k
B. 
k
C. 
k
D. 
k
Solve the problem.The manager of a coffee shop has one type of coffee that sells for $9 per pound and another type that sells for $14 per pound. The manager wishes to mix 50 pounds of the $14 coffee to get a mixture that will sell for $11 per pound. How many pounds of the $9 coffee should be used?
A. 62.5 lb B. 125 lb C. 75 lb D. 37.5 lb
Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.tan 40° cot 40°
A. -1 B. 1 C. 0 D. 40