Solve the problem.A rock falls from a tower that is 142.1 m high. As it is falling, its height is given by the formula 
How many seconds will it take for the rock to hit the ground 
Round to the nearest tenth, if necessary.
A. 11.7 sec
B. 11.9 sec
C. 5.4 sec
D. 4120.9 sec
Answer: C
Mathematics
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A. 
B. 
C. 
D. 
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Solve the formula for the specified letter.S = 
for m
A. m = 
B. m = 
C. m = 
D. m = 
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Decide whether or not the set is closed under multiplication.{Whole numbers}
A. Closed B. Not closed
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Factor.2n2 + 5n - 63
A. (2n - 9)(9 - 2n) B. (2n - 72)(2n - 9) C. (2n - 9)(n + 7) D. (2n - 9)(n - 7)
Mathematics