Simplify.(4 cos 10x - 8 sin 5x cos 5x) 2 + (8 sin 5x cos 5x + 4 cos 10 x)2
A. 16
B. 4 cos2 10x
C. 4 cos2 5x
D. 32
Answer: D
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A. 9 B. 8 C. 11 D. 12
Translate the situation into mathematical language. You need not actually solve the problem.A boat can run 13 kilometers per hour in still water. How long will it take the boat to go 20 kilometers upstream on a river flowing at a rate of 8 kilometers per hour?
A. Let t be the time, in hours, it will take the boat to go 20 kilometers upstream; 21t = 20 B. Let t be the time, in hours, it will take the boat to go 20 kilometers upstream; 20t = 21 C. Let t be the time, in hours, it will take the boat to go 20 kilometers upstream; 20t = 5 D. Let t be the time, in hours, it will take the boat to go 20 kilometers upstream; 5t = 20
Find the indicated intercept(s) of the graph of the function.y-intercept of f(x) = 
A. 
B. (0, 6)
C. 
D. none
Decide where the first digit in the quotient would be located. Then without finishing the division, determine which of the three choices is the correct answer.
A. 6403 B. 64,030 C. 640