Solve the problem.A window washer accidentally drops a bucket from the top of a 256-foot building. The height h of the bucket after t seconds is given by 
When will the bucket hit the ground?
A. 64 sec
B. -4 sec
C. 4 sec
D. 16 sec
Answer: C
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Translate the problem to a system of equations, then solve using Cramer's Rule.Twice the water flow in the hot-water pipe is the same as three times the flow in the cold-water pipe. The combined flow is 1200 liters per hour. What is the flow in each pipe?
A. 600 liters/hr hot, 400 liters/hr cold B. 400 liters/hr hot, 600 liters/hr cold C. 720 liters/hr hot, 480 liters/hr cold D. 480 liters/hr hot, 720 liters/hr cold
Solve.A machinist has flat metal plate that is 7.359 cm thick. He laminates the metal plate with four more layers that are 3.236 cm, 4.518 cm, 4.884 cm, and 4.575 cm thick. He then grinds off 3.958 cm from the top of the plate, then 2.841 cm more, and finally another 4.987 cm. Find the new thickness of the plate.
A. 1.932 cm B. 26.384 cm C. 16.744 cm D. 12.786 cm
Use the horizontal line test to determine whether the function is one-to-one.
A. Yes B. No
Find the standard form of the equation of the parabola using the information given.Focus: (0, -15); Directrix: y = 15
A. x2 = 60y B. y2 = -60x C. x2 = -60y D. y2 = -15x