Express the given quantity in terms of sin x or cos x.sin 
A. cos x
B. -cos x - sin x
C. -cos (-x)
D. -cos x
Answer: D
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Use the discriminant to determine the number and type of solutions of the equation.3 - 7x2 = 8x + 5
A. two real solutions B. two complex but not real solutions C. one real solution
Solve the problem.The perimeter of a rectangle is 40 inches and its area is 99 square inches. What are its dimensions?
A. 8 in. by 10 in. B. 9 in. by 11 in. C. 8 in. by 12 in. D. 10 in. by 10 in.
Solve the problem.Two recording devices are set 3800 feet apart, with the device at point A to the west of the device at point B. At a point on a line between the devices, 200 feet from point B, a small amount of explosive is detonated. The recording devices record the time the sound reaches each one. How far directly north of site B should a second explosion be done so that the measured time difference recorded by the devices is the same as that for the first detonation?
A. 1889.44 feet B. 8016.23 feet C. 423.53 feet D. 1272.55 feet
Find the volume of the pyramid. If necessary, round to the nearest hundredth.
A. 810 ft3 B. 405 ft3 C. 270 ft3 D. 847.8 ft3