Solve the problem.A plane makes a 240-mile trip against a head wind in 1 hour and 30 minutes and returns, with a tail wind of the same speed, in 1 hour. What is the speed of the wind?
A. 160 mph
B. 200 mph
C. 40 mph
D. 80 mph
Answer: C
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Find the center of mass of the wire that lies along the curve r and has density ?.r(t) = 4ti + 8tj + 7t2k, 0 ? t ? 1; ?(x, y, z) = 
A. 
B. 
C. 
D. 
Determine whether the graph is the graph of a function.
A. Yes B. No
Solve the problem.Suppose the following matrix represents the input-output matrix of a simplified economy that involves just three commodity categories: manufacturing, agriculture, and transportation. How many units of each commodity should be produced to satisfy a demand of 900 units for each commodity?
A. 2259 units of manufacturing, 2097 units of agriculture, and 2241 units of transportation B. 2520 units of manufacturing, 2097 units of agriculture, and 2259 units of transportation C. 2241 units of manufacturing, 2538 units of agriculture, and 2097 units of transportation D. 2259 units of manufacturing, 2520 units of agriculture, and 2097 units of transportation
Tonya wants to place an advertisement in a local newspaper to sell her car. This piecewise function shows the cost of the advertisement given that x equals the number of lines.
If the advertisement she wants to place will be 7 lines, how much will the paper charge her?
A. $32.50 B. $29.00 C. $26.50 D. $22.00