Establish the identity.sin3 x cos2 x = sin x (cos2 x - cos4 x)
What will be an ideal response?
sin3 x cos2 x = sin x (1 - cos2 x) (cos2 x) = sin x (cos2 x - cos4 x).
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Graph the inequality.-2x - 4y ? 8
A. 
B. 
C. 
D. 
Solve the problem.A truck driver started a trip at an average speed of 70 miles per hour. Once snow began to fall, he had to drop his speed to 50 miles per hour. It took him 14.2 hours to reach his destination, which was 804 miles away. How many hours after the driver started did the snow begin to fall?
A. 4.5 hr B. 4.7 hr C. 9.5 hr D. 9.7 hr
Solve the problem.A person is watching a car from the top of a building. The car is traveling on a straight road directly toward the building. When first noticed, the angle of depression to the car is 26° 53'. When the car stops, the angle of depression is 42° 31'. The building is 240 feet tall. How far did the car travel from when it was first noticed until it stopped? Round to the nearest foot.
A. 412 ft B. 191 ft C. 212 ft D. 238 ft
Solve the problem.If y varies directly as the cube of x, and y = 4 when x = 28, find y when x = 7.
A. 
B. 256
C. 1
D. 16