Solve.A ball is thrown upward with an initial velocity of 42 meters per second from a cliff that is 
high. The height of the ball is given by the quadratic equation 
where h is in meters and t is the time in seconds since the ball was thrown. Find the time that the ball will be 50 meters from the ground. Round your answer to the nearest tenth of a second.
A. 10.4 sec
B. 9.5 sec
C. 9.4 sec
D. 10.3 sec
Answer: C
Mathematics
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Solve the inequality and write the solution set using interval notation; then graph the solution set on a number line. s2 - 3s - 18 < 0
A. (-3, 6)
B. (6, ?)
C. (-?, -3)
D. (-?, -3) ? (6, ?)
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Find the derivative of the function by using the definition.y = 11 - 7x2
A. -14x2 B. 11 - 14x C. -14x D. 11 - 7x
Mathematics
Solve the problem.In how many ways can a group of 7 students be selected from 8 students?
A. 56 B. 7 C. 1 D. 8
Mathematics
Solve the problem.Brandon can paint a fence in 12 hours and Elaine can paint the same fence in 11 hours. How long will they take to paint the fence if they work together?
A. 5
hr
B. 5
hr
C. 5
hr
D. 11
hr
Mathematics