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bogdanovich [222]
3 years ago
10

Dan uses a remote control to make his drone take off from the ground. Function h represents the height, in feet, of the drone t

seconds after it begins flying.
Which statement correctly describes this situation?

A.
The drone is on the ground at 0 and 16 seconds.
B.
The drone is on the ground at 0 and 4 seconds.
C.
The drone is on the ground at 2 and 4 seconds.
D.
The drone is on the ground at 0 and 2 seconds.
Mathematics
2 answers:
jasenka [17]3 years ago
6 0

Answer: C.   The drone is on the ground at 0 and 4 seconds.

Step-by-step explanation:

Here the function that shows the height of the drone,

h(t) = -16(t-2)^2+64

Where t is the time in seconds.

Since, the drone is ground when, h(t) = 0

-16(t-2)^2+64=0

-16(t-2)^2 = -64   (by subtracting 64 from both sides 64)

(t-2)^2 = 4           (dividing both sides by -16 )

t^2-4t+4= 4        

t^2-4t= 0             (by subtracting 4 from both sides)

t(t-4)= 0      

⇒ t = 0 or t = 4  

Thus, Option C is correct.

LUCKY_DIMON [66]3 years ago
3 0
I think it’s c I am not sure
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Answer:

  • <u><em>P(M) = 0.4</em></u>

Explanation:

<u>1. Build a two-way frequency table:</u>

To have a complete understanding of the scenary build a two-way frequency table.

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                                  Major in math    No major in math  Total

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                                  Major in math    No major in math  Total

Major in CS

No major in CS

Total                                                                                      200

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                                  Major in math    No major in math  Total

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No major in CS

Total                              80                                                   200

  • <u>100 plan to major in computer science</u>:

                                  Major in math    No major in math  Total

Major in CS                                                                           100

No major in CS

Total                              80                                                   200

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                                  Major in math    No major in math  Total

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No major in CS                                                                     100

Total                              80                             120                200

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