Determine whether the statement is true or false.cos 30° + cos 45° = cos 75°
A. True
B. False
Answer: B
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Using the Divergence Theorem, find the outward flux of F across the boundary of the region D.F = x
i + y
j + z
k ; D: the thick cylinder 4 ? x2 + y2 ? 5 , 
A. 488? B. 976? C. 1464? D. 244?
Use a calculator with a 
key to solve the problem.The function f(x) = 90e-0.2x + 10 models the percentage of information, f(x), that a particular person remembers x weeks after learning the information. a) Substitute 0 for x and, without using a calculator, find the percentage of information remembered at the moment it is first learned. b) Find the percentage of information that is remembered after 4 weeks. Round to the nearest thousandth of a percent.
A. a) 10%; b) 10.449% B. a) 50%; b) 210.299% C. a) 90%; b) 40.440% D. a) 100%; b) 50.440%
Graph the polar equation.r2 = 34 sin 4?
A. 
B. 
C. 
D. 
The graph of a function f is given. Use the graph to answer the question.Find the numbers, if any, at which f has a local minimum. What are the local minima?
A. f has a local minimum at x = -2 and 2; the local minimum is 0 B. f has a local minimum at x = -2; the local minimum is 0 C. f has a local minimum at x = 0; the local minimum is 1 D. f has no local minimum