Find the indicated trigonometric function, given that ? is an angle in standard position with the terminal side passing through the given point.(15, 20); Find cos ?.
A. 
B. 
C. 
D. 
Answer: A
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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 772. Find a linear function, S(t), which fits this data, and which expresses score as a function of time. Use this function to predict an average score for persons taking a 51-hour review course. Round your answer to the tenths place.
A. 692.5 B. 713.8 C. 704.0 D. 699.8
Multiply. Simplify if possible.8x4 ? 
A. 
B. 
C. 
D. 
Use properties of logarithms to expand the logarithmic expression as much as possible. Where possible, evaluate logarithmic expressions without using a calculator.logw
A. logw3x B. logw7 +logwx - logw4 C. logw7 +logwx + logw4 D. logw7x -logw4
Find the indicated roots. Write the answer in a + bi form.Fifth roots of -1 - i
A. 1 + i, -0.65 + 1.25 i, 1.39 - 0.22 i, -0.22 - 1.39 i, 1.25 - 0.65 i B. 1 + i, -0.65 + 1.25 i, 1.39 + 0.22 i, -0.22 + 1.39 i, -1.25 - 0.65 i C. 0.76 + 0.76 i, -0.49 - 0.95 i, 1.05 + 0.17 i, -0.17 - 1.05 i, 0.95 - 0.49 i D. 0.76 + 0.76 i, -0.49 + 0.95 i, 1.05 - 0.17 i, -0.17 - 1.05 i, 0.95 - 0.49 i