Decide whether the given set of numbers is a commutative group under the given operation.Even integers; addition
A. Yes
B. No
Answer: A
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Graph the function.f(x) = - 
A. 
B. 
C. 
D. 
Solve. Write the answer in simplest form.How many 
pound boxes of cereal can be made from 18,480 pounds of cereal?
A. 8085 boxes B. 42,240 boxes C. 2640 boxes D. 1155 boxes
Use the discriminant to determine the number of real solutions.s2 + 3s - 4 = 0
A. One real solution B. Two real solutions C. No real solutions
Solve the problem.The wind is blowing at 10 knots. Sailboat racers look for a sailing angle to the 10-knot wind that produces maximum sailing speed. This situation is now represented by the polar graph in the figure shown below. Each point (r, ?) on the graph gives the sailing speed, r, in knots, at an angle ? to the 10-knot wind. What is the speed to the nearest knot, of the sailboat sailing at 30° angle to the wind? 
A. 4 knots B. 5 knots C. 2 knots D. 3 knots