Solve the problem.A ball is thrown upward with an initial velocity of 21 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 it takes the ball to hit the ground. Round your answer to the nearest tenth of a second.
A. 6.5 seconds
B. 6.2 seconds
C. 6.8 seconds
D. 9.5 seconds
Answer: A
Mathematics
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Rewrite the expression in terms of exponentials and simplify the results.10 cosh (ln x)
A. 5(ex+ e-x)
B. 0
C. 5x
D. 5
Mathematics
Provide an appropriate response.Consider the following preference schedule.
If the winner is decided by plurality, which of the following fairness criteria is violated?
A. Fairness Criterion 1 B. Fairness Criterion 4 C. Fairness Criterion 3 D. All of these
Mathematics
Use implicit differentiation to find the specified derivative at the given point.Find 
at the point (1, -1) for -7xy2 + 2x2y + 7x = 0.
A. - 
B. 
C. 
D. - 
Mathematics
Perform the operation indicated.(2p2 - 2p - 6) + (-4p2 - 9p - 12)
A. -33p2 + 11p + 18 B. 6p2 + 7p + 6 C. -34p - 7p - 6 D. -2p2 - 11p - 18
Mathematics