Solve the problem.An exam consists of 9 multiple-choice questions and 6 essay questions. If the student must answer 6 of the multiple-choice questions and 4 of the essay questions, in how many ways can the questions be chosen?
A. 261,273,600
B. 1260
C. 21,772,800
D. 1296
Answer: B
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Solve the problem. Round your answer, if appropriate.One airplane is approaching an airport from the north at 150 km/hr. A second airplane approaches from the east at 202 km/hr. Find the rate at which the distance between the planes changes when the southbound plane is 28 km away from the airport and the westbound plane is 20 km from the airport.
A. -239 km/hr B. -358 km/hr C. -478 km/hr D. -119 km/hr
Solve the problem.Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 25 pounds of feed worth $0.25 per pound by mixing one kind worth $0.15 per pound with another worth $0.31 per pound. How many pounds of the cheaper kind should they use in the mix? Round your answer to the nearest pound, if necessary.
A. 16 pounds B. 9 pounds C. 11 pounds D. 21 pounds
Use the figure below to answer the following question(s).
The nearest-neighbor tour with starting vertex A is A, B, C, D, A
A. only if 1 ? x ? 8. B. only if 2 < x < 8. C. only if x < 5. D. only if x = 1. E. regardless of the value of x.
Write the interval in set-builder notation and graph the set on a number line.
A. 
B. 
C. 
D. 
