Solve the problem.In a certain lottery, 4 different numbers between 1 and 9 inclusive are drawn. These are the winning numbers. How many different selections are possible? Assume that the order in which the numbers are drawn is not important.
A. 6561
B. 126
C. 3024
D. 24
Answer: B
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Solve the problem.A barge takes 4 hours to move (at a constant rate) downstream for 32 miles, helped by a current of 2 miles per hour. If the barge's engines are set at the same pace, find the time of its return trip against the current.
A. 64 hr B. 8 hr C. 6 hr D. 4 hr
Factor the trinomial containing two variables.u2 - 3uv - 40v2
A. (u - 5v)(u + 8v) B. (u - 5v)(u + v) C. (u - v)(u + 8v) D. (u + 5v)(u - 8v)
Find all angles in degrees that satisfy the equation. Round approximate answers to the nearest tenth of a degree.sin ? = 0.824
A. {
? = 55.5° + k360° or ? = 235.5° + k360°}
B. {
? = 55.5° + k360° or ? = 124.5° + k360°}
C. {
? = 34.5° + k360° or ? = 145.5° + k360°}
D. {
? = 34.5° + k360° or ? = 325.5° + k360°}
Solve the problem.The polynomial 
measures the concentration of a dye in the bloodstream x seconds after it is injected. Does the concentration increase between 11 and 12 seconds?
A. Yes B. No