Solve the problem.Two trains leave a train station at the same time. One travels east at 8 miles per hour. The other train travels west at 7 miles per hour. In how many hours will the two trains be 27 miles apart?
A. 0.9 hr
B. 1.8 hr
C. 3.6 hr
D. 2.3 hr
Answer: B
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Classify the equation as a contradiction, an identity, or a conditional equation.40m + 25 = 5(3m - 20)
A. Contradiction B. Identity C. Conditional
Solve the equation for x if 
. Give your answer in radians using exact values only.
?
What will be an ideal response?
Solve the linear programming problem.An airline with two types of airplanes, P1 and P2, has contracted with a tour group to provide transportation for a minimum of 400 first class, 750 tourist class, and 1500 economy class passengers. For a certain trip, airplane P1 costs $10,000 to operate and can accommodate 20 first class, 50 tourist class, and 110 economy class passengers. Airplane P2 costs $8500 to operate and can accommodate 18 first class, 30 tourist class, and 44 economy class passengers. How many of each type of airplane should be used in order to minimize the operating cost?
A. 11 P1 planes and 7 P2 planes
B. 7 P1 planes and 11 P2 planes
C. 5 P1 planes and 17 P2 planes
D.
| 9 P1 planes and 13 P2 planes |
Simplify. Assume all variables are non-negative real numbers.
A. 2xy2
B. 2xy
C. 2x
D. 2x2