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Neporo4naja [7]
2 years ago
14

John's computer battery goes to 0% every 6 hours if at 100%, and, when plugged in, charges at half the speed it drains at.

Mathematics
1 answer:
Marysya12 [62]2 years ago
7 0

Answer:

Step-by-step explanation: A. two and half hours.

B. 6 hours.

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Which inequality has a solution that is the set of all real numbers?
kati45 [8]

Answer:

12<14

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Step-by-step explanation:

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Find the equation of a parabola with a focus at (0,-1) and a directrix at y = 4.
Anastasy [175]

Answer:

  y = -1/10x^2 +2.5

Step-by-step explanation:

The distance from focus to directrix is twice the distance from focus to vertex. The focus-directrix distance is the difference in y-values:

  -1 -4 = -5

So, the distance from focus to vertex is p = -5/2 = -2.5. This places the focus 2.5 units below the vertex. Then the vertex is at (h, k) = (0, -1) +(0, 2.5) = (0, 1.5).

The scale factor of the parabola is 1/(4p) = 1/(4(-2.5)) = -1/10. Then the equation of the parabola is ...

  y = (1/(4p))(x -h) +k

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_____

You can check the graph by making sure the focus and directrix are the same distance from the parabola everywhere. Of course, if the vertex is halfway between focus and directrix, the distances are the same there. Another point that is usually easy to check is the point on the parabola that is even with the focus. It should be as far from the focus as it is from the directrix. In this parabola, the focus is 5 units from the directrix, and we see the points on the parabola at y=-1 are 5 units from the focus.

5 0
3 years ago
What is the rectangular form of 12(cos(Pi) + isin(Pi))?<br><br> 12<br> -12<br> 12 + i<br> –12 + i
aliya0001 [1]

Answer:

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

since the opposite side looks identical to the first angle, the second would be the same degrees.

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What is the square root of a million?
dimaraw [331]

Answer: 1000

Step-by-step explanation:

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3 years ago
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