3 years ago

How do you find rate in miles per hour

Mathematics

2 answers:

My name is Ann [436]3 years ago

8 0

You divide the miles by the hours

vagabundo [1.1K]3 years ago

7 0

Divide the number of miles/hours

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Step-by-step explanation:

It is given that, the height h, in feet of a ball above the ground is given by :

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Where t is in seconds

We need to find how long does it take the ball to hit the ground? When it hits the ground, its height will be equal to 0. So,

$-16t^2+64t+80=0\\\\t=\dfrac{-64\pm \sqrt{(64)^2-4\times (-16)(80)} }{2\times -16}\\\\t=\dfrac{-64+ \sqrt{(64)^2-4\times (-16)(80)} }{2\times -16},\dfrac{-64-\sqrt{(64)^2-4\times (-16)(80)} }{2\times -16}\\\\t=-1\ s\ \text{and}\ t=5\ s$

Neglecting negative time.

It means ball will take 5 seconds to hit the ground.

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