Solve the problem.If a rock is thrown vertically upward from the top of a building 80 feet high with an initial velocity of 64 feet per second, the height, h, above ground level after t seconds is given by h = -16t2 + 64t + 80, where h is in feet and t is in seconds. How many seconds will it take the rock to reach its maximum height?
A. 1 sec
B. 5 sec
C. 4 sec
D. 2 sec
Answer: D
Mathematics
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Find a pattern and use it to solve the problem.Find the next term: 6, 12, 18, 30
A. 60 B. 42 C. 66 D. 36
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Factor.x2 + 2xy - 8y2
A. (x + 4y)(x - 2y) B. (x - y)(x + 2y) C. (x - 4y)(x + 2y) D. (x - 4y)(x + y)
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Solve.
x = 
- 
A. - 
B. 
C. 
D. - 
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Find the LCM by factoring.8, 20
A. 40 B. 20 C. 28 D. 160
Mathematics