Solve the problem.A rock falls from a tower that is 78.4 m high. As it is falling, its height is given by the formula 
with t in seconds. How many seconds will it take for the rock to hit the ground (h = 0)?
A. 1254.4 sec
B. 8.6 sec
C. 8.9 sec
D. 4 sec
Answer: D
Mathematics
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A. 
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B.
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D.
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Find the derivative.y = 
A. 
B. 
C. 
D. 
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Solve the system of equations. x - y + 4z = -53x + z = 0 x + 5y + z = 25
A. ? B. {(0, 5, -5)} C. {(0, 0, 5)} D. {(0, 5, 0)}
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Graph the linear equation.-7x - y = 5
A. 
B. 
C. 
D. 
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