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allsm [11]
3 years ago
10

Which best describes the function represented by the table?

Mathematics
1 answer:
trasher [3.6K]3 years ago
8 0

Answer:

Option B is correct.

direct variation; k = 5/2

Step-by-step explanation:

The Direct variation says:

y \propto x

then the equation is of the form: y = kx   ......[1] where k is the constant of variation.

From the given table:

Consider x = -2 and y = -5

Substitute these in [1] to solve for k;

-5 = -2k

or

5 = 2k

Divide both sides by 2 we get;

k = \frac{5}{2}

⇒ the equation becomes: y = \frac{5}{2}x

Check:

Take x = 4 and y = 10;

y = \frac{5}{2}x

10 = \frac{5}{2} \times 4

10 = 5 \times 2

10 = 10  True

Therefore, the direct variation ; k = \frac{5}{2} best describe the function represented by the table

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The question is given in the picture.
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θ/360 = a/A

Where “a” is the area swept out by θ, and A is the area of the whole circle, which, given a radius of r, is πr^2. Substituting this in, we have

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Solving for “a”:

a = π(r^2)θ/360

So, we have the formula for the area of one of those sectors; all we need to do now is find θ and multiply our result by 6, since we have 6 circles. We can preempt this but just multiplying both sides of the formula by 6:

6a = 6π(r^2)θ/360

Which simplifies to

6a = π(r^2)θ/60

Now, how do we find θ? Let’s look first at the exterior angles of a hexagon. Imagine if you were taking a walk around a hexagon. At each corner, you turn some angle and keep walking. You make 6 turns in all, and in the end, you find yourself right back at the same place you started; you turned 360 degrees in total. On a regular hexagon, you’d turn by the same angle at each corner, which means that each of the six turns is 360/6 = 60 degrees. Since each interior and exterior angle pair up to make 180 degrees (a straight line), we can simply subtract that exterior angle from 180 to find θ, obtaining an angle of 180 - 60 = 120 degrees.

Finally, we substitute θ into our earlier formula to find that

6a = π(r^2)120/60

Or

6a = 2πr^2

So, the area of all six sectors is 2πr^2, or the area of two circles with radii r.
5 0
3 years ago
I need help with this question. Melissa is baking a birthday cake for her best friend and the preparation time is 12 minutes, wh
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Answer:

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