SOMEONE WHO CAN SIMPLY ORDER INTERVALS!

Mathematics

1 answer:

OlgaM077 [116]4 years ago

3 0

Answer:

2.5 seconds.

Step-by-step explanation:

Find the value of t when the height is 28 feet:

-16t^2 + 56t + 4 = 28

-16t^2 + 56t - 24 = 0

-8(2t^2 - 7t + 3) = 0

-8(2t - 1)(t - 3) = 0

t = 0.5, 3 seconds.

So on the upward journey the rock is at 28 feet at 0.5 second after the throw and at 3 seconds it is at 28 feet again while it is falling back.

Therefore the period when it is at least 28 feet above the ground is 3.0 - 0.5 = 2.5 seconds.

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Eduardwww [97]

Answer:

Refer to the attachment $\Huge{\blue{\nearrow}}$

Step-by-step explanation:

<h3><u>Diagram</u><u>:</u><u>-</u></h3>

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