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Iteru [2.4K]
2 years ago
9

A car valued at £15000

Mathematics
1 answer:
lara31 [8.8K]2 years ago
7 0
The answer u can take 15000x5=75.000
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Find the equation of a parabola with a focus at (0,-1) and a directrix at y = 4.
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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 slope of 4,17 and 1,8
Sindrei [870]

Answer:

Slope (m)= 3

Step-by-step explanation:

m= (Y2-Y1)/(X2-X1)

m= (17-8)/(4-1)

m= 9/3

m=3

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2 years ago
−1/3 −(−1/2)<br><br> Brainliest for the right answer
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The answer would be -1/6 or -0.166667

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The ratio of a basketball player's completed free throws to attempted free throws is 4 to 7. If she completed 12 free thro
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Step-by-step explanation:

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3 years ago
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How do you know the quotient of 639÷6 is greater than 100 before you actually divide
svp [43]
The 6 in the hundreds place tells you the quotient is at least 100. The non-zero digits in the 1s and 10s places tell you the quotient is more than 100.
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3 years ago
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