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solniwko [45]
3 years ago
5

A soccer ball is kicked from the ground at an upwards velocity of 90 feet per second. The equation h(t)=-16t^(2)+90t gives the h

eight of the ball after t seconds. How many seconds will it take for the ball to reach its maximum height?
I need help figuring this out to help my grade
Mathematics
1 answer:
garri49 [273]3 years ago
5 0

Answer: 2.81 s

Step-by-step explanation:

Given

Ball is kicked upward with velocity u=90\ ft/s

Height of the ball is given by the function h(t)=-16t^2+90t

Derivative of a function gives the maxima or minima at certain point

\Rightarrow \dfrac{dh}{dt}=-32t+90\\\\\Rightarrow \dfrac{dh}{dt}=0\\\\\Rightarrow -32t+90=0\\\\\Rightarrow t=\dfrac{90}{32}\\\\\Rightarrow t=2.81\ s

Thus, it takes ball 2.81 s to reach the top.

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Which ordered pair represents the y-intercept of the graph of the equation y = - 4 x - 7 ?​
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Answer:

(0, -7)

Step-by-step explanation:

Since -4x is the slope, then -7 is the y-intercept.

For finding y intercept we substitute x=0

y = -7

The ordered pair would be

(0,-7)

hope this helps and is right. p.s. i really need brainliest :)

4 0
3 years ago
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Mandarinka [93]

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A road construction crew paves 1/5 mile every day. How much would they pave in 2 days?
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7 0
3 years ago
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kaheart [24]
I don't think this is middle school...

(2^8 x 3^-5 x 6^0)^-2 x ((3^-2)/(2^3))^4 x (2^28)

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</span><span>
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</span>8.99999997623

9



9 is your answer.
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3 years ago
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