Solve the problem.The altitude h (in m) of a rocket is given by h = -2t3 + 90t2 + 400t + 30, where t is the time (in s) of the flight. When does the rocket hit the ground?

A. 50.107 s
B. 49.081 s
C. 47.529 s
D. 46.327 s


Answer: B

Mathematics

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A. True B. False

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Add. + (- )

A. -  
B.  
C. -  
D.

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Find an equation for the ellipse described.Focus at (0, -2); vertices at (0, ±7)

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B.  +  = 1
C.  +  = 1
D.  +  = 1

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