Solve the 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. 7 P1 planes and 11 P2 planes
B. 11 P1 planes and 7 P2 planes
C. 9 P1 planes and 13 P2 planes
D. 20 P1 planes and 0 P2 planes
Answer: D
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The problem tells by what factor and direction the graph of the given function is to be stretched or compressed. Give an equation for the stretched or compressed graph.y = x2 + 3
stretched horizontally by a factor of 3
A. y = 
+ 3
B. y = 9x2 + 3
C. y = 
+ 3
D. y = 3x2 + 9
Solve using the addition principle.5.3 = 22.5 - t
A. -27.8 B. 17.2 C. -17.2 D. 27.8
Perform the operations.1.4070 × 105
A. 14,070 B. 70.35 C. 1,407,000 D. 140,700
Solve the problem.The demand for a specialized oil-drilling engine is given by the demand function D(x) = 
where x is the number of units produced each day and D(x) is the number sold each day. Assume that x is an integer. What is the daily demand for this item (units sold each day) if 15 units are produced each day? Round to the nearest integer.
A. 67 units per day B. 28 units per day C. 48 units per day D. 63 units per day