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galben [10]
3 years ago
6

I have no clue how to solve this please help

Mathematics
1 answer:
borishaifa [10]3 years ago
5 0
What are you trying to solve dear
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What is the equation of a parabola with a focus (-2,4) and directrix y = 0?
Ronch [10]
The general form of a parabola  when using the focus and directrix is:
(x - h)² = 4p(y - k) where (h, k) is the vertex of the parabola and 'p' is distance between vertex and the focus.  We use this form due to the fact we can see the parabola will open up based on the directrix being below the focus.  Remember that the parabola will hug the focus and run away from the directrix.  The formula would be slightly different if the parabola was opening either left or right.

Given a focus of (-2,4) and a directrix of y = 0, we can assume the vertex of the parabola is exactly half way in between the focus and the directrix.  The focus and vertex with be stacked one above the other, therefore the vertex will be (-2, 2) and the value of 'p' will be 2.  We can now write the equation of the parabola:
(x + 2)² = 4(2)(y - 2)
(x + 2)² = 8(y - 2)  Now you can solve this equation for y if you prefer solving for 'y' in terms of 'x'
5 0
3 years ago
Congruence postulates
ZanzabumX [31]

Step-by-step explanation:

Ok, imagine I have a finger pointed up, and you have your's as well. They are not congruent / parallell to each other because they are not in the same plane.

Plane: A plane is kind of the space around you, so take a paper and draw a line, the space around the line is called a plane. To make two lines parallell, they have to be straight and be in the same plane

Congruence/congruent= Equal(led) to

Postulates means that you know it without proof, for example, a right angle is 90 degrees.

There are different congruence postulates. It can be used for triangles or for other shapes.

I hope this answers your question, I am not to sure on what you said !

6 0
3 years ago
Tom had $56. He bought a soda for $2 and 2 cookies for $3. Which expression correctly shows the total money Tom has left? A. $56
deff fn [24]

C ($56) - ($2) - ($3)

4 0
3 years ago
Barry spent 1/5 of his monthly salary for rent and 1/7 of his monthly salary for his school loans. If $851 was left, what was hi
Effectus [21]

Answer:

1295$

Step-by-step explanation:

Let's denote the monthly salary of Barry A.

Then we have:

A - (1/5)A - (1/7)A = 851

or

(35A - 7A - 5A)/35 = 851

or

23A = 851 x 35

or

23A = 19785

or

A = 1295$

4 0
3 years ago
What is the volume of 2/5m and 2 4/5m3
Ira Lisetskai [31]

Answer:

Step-by-step explanation:

36 cubic meters

4 0
3 years ago
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