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GrogVix [38]
3 years ago
5

Someone please help me I got those three red boxes incorrect so many times

Mathematics
2 answers:
sp2606 [1]3 years ago
8 0

Hi there!

-10-2 is equal to -12, not -8. This changes everything.

The fraction would be -12/16, which simplifies to -3/4.

I hope this helps!

Lera25 [3.4K]3 years ago
4 0

Answer:

1st red box:

-10 - 2 = -12

2nd box above:

-3

3rd box:

4

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2 years ago
H=255-21t-16t^2<br><br> PLEASE HELP!!
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Answer:

3.15 seconds is the answer.

<u>Explanation</u>

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t=   \frac{ - b± \sqrt{ {b }^{2}  - 4ac} }{2a} \\  \\ t=   \frac{ - 21± \sqrt{ {21}^{2}  - 4 \times 16 \times  - 225} }{2 \times 16} \\  =  \frac{ - 21 ± \sqrt{441 - ( - 14400)} }{32} \\  =  \frac{ - 21± \sqrt{14841} }{32}  \\  =  \frac{ - 21±121.82}{32}  \\  \\ t =   \frac{ - 21 + 121.82}{32}  \: or \:  \: t =  \frac{ - 21 - 121.82}{32}  \\ t = 3.15 \:  \: or \:  \: t =  - 4.46

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The ball takes 3.15 seconds to hit the ground.

4 0
3 years ago
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