Solve the problem.The Smith family is planning a 517-mile trip. If they travel at an average speed of 47 miles per hour, what will be their travel time? (Use d = rt)
A. 13 hr.
B. 11 hr.
C. 12 hr.
D. 10 hr.
Answer: B
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Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 1; local maximum at x =-1; concave down on (0, ?); concave up on (-?, 0) B. Local maximum at x = 1; local minimum at x =-1; concave up on (0, ?); concave down on (-?, 0) C. Local maximum at x = 1; local minimum at x =-1; concave up on (-?, ?) D. Local minimum at x = 1; local maximum at x =-1; concave up on (0, ?); concave down on (-?, 0)
Prepare a probability distribution for the experiment. Let x represent the random variable, and let P represent the probability.Two marbles are drawn from a bag in which there are 4 red marble and 2 blue marble. The number of blue marbles is counted.
A. 
B. 
C. 
D. 
Find all the complex roots. Leave your answers in polar form with the argument in degrees.The complex fourth roots of -16
A.
| 16(cos 45° + i sin 45°), 16(cos 135° + i sin 135°), 16(cos 225° + i sin 225°), 16(cos 315° + i sin 315°) |
B.
(cos 45° + i sin 45°), 
(cos 135° + i sin 135°), 
(cos 225° + i sin 225°), 
(cos 315° + i sin 315°)C. 2(cos 45° + i sin 45°), 2(cos 135° + i sin 135°), 2(cos 225° + i sin 225°), 16(cos 315° + i sin 315°)
D. 2(cos 90° + i sin 90°), 2(cos 180° + i sin 180°), 2(cos 270° + i sin 270°), 2(cos 360° + i sin 360°)
Solve.John owns a hotdog stand. He has found that his profit is represented by the equation 
with P being the profit in dollars, and x the number of hotdogs sold. How many hotdogs must he sell to earn the most profit?
A. 24 hotdogs B. 30 hotdogs C. 49 hotdogs D. 31 hotdogs