Solve the problem.A jet plane traveling at a constant speed goes 1400 miles with the wind, then turns around and travels for 1200 miles against the wind. If the speed of the wind is 50 mph and the total flight took 4 hours, find the speed of the plane in still air.
A. 535 mph
B. 625 mph
C. 705 mph
D. 650 mph
Answer: D
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Solve the problem.A power plant is located on a river that is 650 feet wide. To lay a new cable from the plant to a location in a city 1 mile downstream on the opposite side costs $225 per foot across the river and $150 per foot along the land. Suppose that the cable goes from the plant to a point Q on the opposite side that is x feet from the point P directly opposite the plant. Write a function C(x) that gives the cost of laying the cable in terms of the 
A. C(x) = 225
+ 150(5280 - x)
B. C(x) = 225(650 - x) + 150(1 - x)
C. C(x) = 225
+ 150(1 - x)
D. C(x) = 150
+ 225(5280 - x)
Find the term that should be added to the expression to form a perfect square trinomial. Write the resulting perfect square trinomial in factored form.x2 - 
x
A. 
; 
2
B. 
; 
2
C. 9; 
2
D. - 
x; 
2
Multiply or divide as indicated. Write the answer in lowest terms.1
? 3
A. 7
B. 3
C. 13
D. 6
Solve, finding all solutions in [0, 2?).4 sin2x = 4 cos x + 1
A. 
, 
B. 
, 
C. 
, 
D. No solution