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marta [7]
3 years ago
15

Melanie answered 18 of

Mathematics
2 answers:
Neporo4naja [7]3 years ago
8 0
75% would be correct
Butoxors [25]3 years ago
3 0

75 percent

Megan answered 18 questions correctly on a test. That is 75 percent of the total number of questions (24) which were on the test.

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find an equation in the form y=ax^2+bx+c for the parabola passing through the points. (2,28),(4,116),(-3,88)
IgorC [24]
<h3>Answer:</h3>

y = 8x² -4x +4

<h3>Explanation:</h3>

I find it quick and easy to let a graphing calculator do quadratic regression on the given points. It gives the coefficients of the equation directly. (See attached.)

_____

If you want to do this "by hand," you can substitute each of the x and y value pairs into the equation to get three linear equations in a, b, and c. These are generally easy to solve, as the "c" variable can be eliminated right away.

<em>For x = 2</em>

... 28 = a·2² +b·2 +c = 4a +2b +c

<em>For x = 4</em>

... 116 = a·4² +4b +c = 16a +4b +c

<em>For x = -3</em>

... 88 = a·(-3)² +b·(-3) +c = 9a -3b +c

Subtracting the first and third equations from the second, we have ...

... (16a +4b +c) -(4a +2b +c) = (116) -(28) ⇒ 12a +2b = 88

... (16a +4b +c) -(9a -3b +c) = (116) -(88) ⇒ 7a +7b = 28

Dividing the first of these reduced equations by 2, and the second by 7, we have ...

  • 6a +b = 44
  • a +b = 4

Subtracting the second of these from the first gives ...

... (6a +b) -(a +b) = (44) -(4) ⇒ 5a = 40

From which we find

... a = 8

... b = 4 -a = 4 -8 = -4

We choose the first of the original equations to find c:

... c = 28 -4a -2b = 28 -4·8 -2(-4)

... = 28 -32 +8 = 4

With (a, b, c) = (8, -4, 4), the equation of the parabola is ...

... y = 8x² -4x +4

5 0
3 years ago
Add and express your answer in scientific notation (5.7 x 10^8) +(3.2 x 10^6)
kaheart [24]

5.7+3.2=8.9

10^8+10^6=10^14

(8.9+10^14)

---

hope it helps

3 0
2 years ago
What is the mean of the data set
jeyben [28]

To find mean all you have to do is add all the numbers up and divide ny how many numbers there are.  If you add them all together is equals 1295. now divide that number by the amount of numbers there are which is 10, and divide 1295 by 10.  You get 129.5

7 0
3 years ago
A regular pentagon ABCDE is shown <br><br><br> Work out the size of X
nikdorinn [45]
The sum of the angles in a pentagon is 540°.

This means that each angle is 108°.

Inside you pentagon, a triangle is drawn. This triangle is isosceles, because the corners are on the points of the regular pentagon. You know that angle C is 108°.

Angles in a triangle add up to 180°.

B and D will be the same size as this is isosceles.

180°-108° = 72°

This is B and D. You only need one of these, so you divide by 2.

The answer is 36°.

Hope this helps :)
7 0
3 years ago
Read 2 more answers
Can someone help me with this surface area plz plz thanks
Lunna [17]
Just multiply all of them and if you aren’t sure just search up how to find serfsce area
4 0
2 years ago
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