Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.tan 390°
A. 
B. 
C. -
D. 
Answer: B
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Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 786. Find a linear equation which fits this data, and use this equation to predict an average score for persons taking a 41-hour review course. Round your answer to the tenths place.
A. 669.9 B. 679.7 C. 665.7 D. 658.4
Choose the expression which is equivalent to the given expression.
A. tan 7° B. cot2 7° C. tan2 7° D. cot 7°
Determine whether the statement is true or false.Some rational numbers are integers.
A. true B. false
Determine whether the lines associated with the functions are parallel, perpendicular, or neither.f(x) = x - 6f(x) = -x
A. Neither B. Parallel C. Perpendicular