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3 years ago

7th grade work pls help!

Mathematics

2 answers:

Novay_Z [31]3 years ago

8 0

Answer:

i really dont understand

Step-by-step explanation:

den301095 [7]3 years ago

7 0

What is this I really don’t understand this

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A pack of gum costs 75 cents. That is 3 cents less than three times what the pack cost 20 years ago. Which equation could be use

Tamiku [17]

75-3×3x=?
I believe that would be the equation.

7 0

3 years ago

Read 2 more answers

Use the given information to write the equation of the parabola.

m_a_m_a [10]

Answer:

x² = -2y

Step-by-step explanation:

The focus is p away from the vertex, and so is the directrix.

To find the equation of the parabola, we must first determine if the parabola is horizontal or vertical.

Horizontal parabola [Standard form]: (y – k)² = 4p(x – h)
Vertical parabola [Standard form]: (x – h)² = 4p(y – k)

If the parabola is vertical, the directrix, and focus will have the same x value but different y value compared to the vertex (h, k). You can also tell if the directrix in in the form y = k – p, and if the focus is in the form (h, k + p).

Likewise, if the parabola is horizontal, the directrix, and focus will have the same y value but different x value compared to the vertex (h,k) . You can also tell if the directrix is in the form x = h – p, and if the focus is in the form (h + p, k).

For this problem, given that the vertex is at the origin (0,0), and that the focus is at the point (0, -½).

You can tell that the x value is the same for the vertex, and focus so this must be a vertical parabola. Because this is a vertical parabola, we can use the form mentioned as earlier (x – h)² = 4p(y – k).

If h = 0, and k = 0, the p value must be the difference between the k of the vertex, and the k of the focus: -½ - 0 → -½.

Now we can just plug in our known information to derive the equation!

h = 0, k = 0, p = -½ → (x - h)² = 4p(y - k) →

(x - 0)² = 4(-½)(y - 0) → x² = -2(y - 0) →

x² = -2y.

Also p = 1/4a, if you are wondering.

So because this is a vertical parabola, x² = -2y is generally the same as y = -1/2x² in standard quadratic form. I just like to think of the horizontal parabola as an inverse quadratic because it is like reflecting over the line y = x.

8 0

3 years ago

Read 2 more answers

Please help<br> Complete the equation describing how<br> x and y are related.

djverab [1.8K]

Answer:

y = 5x + 3

Step-by-step explanation:

The answer that belongs in the ? is 5.

4 0

2 years ago

(8b+12)+(3n+6)+(9b-4)

Bas_tet [7]

Answer:

17b+3n+14

Step-by-step explanation:

no any step

okk

finished

5 0

3 years ago

Read 2 more answers

Help please!!!! i dont know how to do this

IRINA_888 [86]

All the angles created by the transversal intersecting through a pair of parallel lines have got many names and connections with each other, like Alternate Angles, Corresponding angles, consecutive interior angles etc.

As per the question statement, We are given a pair of parallel lines which is cut by a transversal. We are supposed to mark the following angles.

Alternate Interior Angles, Alternate Exterior Angles, Corresponding Angles and Consecutive Interior Angles.

Here is an attached image of the same with angles marked on it.

Alternate Interior Angles: ∠ $3$ = ∠ $5$ and ∠ $4$ =∠ $6$

Alternate Exterior Angles: ∠ $2$ =∠ $8$ and ∠ $1$ =∠ $7$

Corresponding Angles: ∠ $1$ =∠ $5$ , ∠ $4$ =∠ $8$ , ∠ $3$ =∠ $7$ and ∠ $2$ =∠ $6$

Consecutive Interior Angles: ∠ $4$ =∠ $5$ and ∠ $3$ =∠ $6$

Parallel Lines: Parallel lines are those straight lines that are, no matter how far they are extended, always the same distance apart from one another.
Transversal Line: In geometry, a transversal line intersects two lines in the same plane at two different locations.

To learn more about Transversal Line click on the link given below:

brainly.com/question/24770636

#SPJ1

8 0

1 year ago