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Quadratic functions (5 pts) A ball is thrown upward at 40 feet per second from the top of a
building that is 30 feet high.
The height of the ball can be modeled by y = 30 + 40x - 16x2 feet where x is the number of
seconds after the ball is thrown. When will the ball first reach a height of 45 feet?

Respuesta :

ryanfray4443

Step-by-step explanation:

0=30+40x - 32x

0=30 + 8x

-8x = 30

x = -15/4

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