Solve the problem.If a plane can travel 350 miles per hour with the wind and only 250 miles per hour against the wind, find the speed of the wind and the speed of the plane in still air.
A. Plane: 300 mph, wind: 60 mph
B. Plane: 50 mph, wind: 300 mph
C. Plane: 400 mph, wind: 50 mph
D. Plane: 300 mph, wind: 50 mph
Answer: D
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Find the absolute maxima and minima of the function on the given domain.
on the trapezoidal region with vertices 
and 
A. Absolute maximum: 11 at 
absolute minimum: 0 at 
B. Absolute maximum: 11 at 
absolute minimum: 8 at 
C. Absolute maximum: 6 at 
absolute minimum: 0 at 
D. Absolute maximum: 16 at 
absolute minimum: 8 at 
The scores on a 30-point multiple-choice exam are given in the following frequency table:
What is the mode of the scores on the exam?
A. 23, 24, 27, and 28 B. 25.5 C. 25 and 29 D. 26 and 30
Solve the linear equation.-4x + 6(2x - 7) = -31 - 3x
A. 
B. 
C. {1}
D. {- 1}
In a graph showing voltage on the x-axis and current on the y-axis, the voltage changes 3 volts and the current changes 9 ma. What resistance does this represent?
a. 330 ohms b. 300 ohms c. 270 ohms d. 33 ohms e. 30 ohms