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eduard
3 years ago
15

PLEASE HELP.

Mathematics
1 answer:
Lubov Fominskaja [6]3 years ago
5 0

<em>I know this is an older question, but for those who may come across this question, this is the answer I got.</em>

<em></em>

Answer:

The answer is $17.5.

Step-by-step explanation:

<em>c(x) = ax^(2) + bx + c</em>

c(3) = 15.5 = (equation)

  • a(3)^2 + b(3) + c = 15.5
  • (9a + 3b + c = 15.5)

c(7) = 23.5 = (equation)

  • a(7)^2 + b(7) + c = 23.5
  • (49a + 7b + c = 23.5)

c(12) = 56 = (equation)

  • a(12)^2 + b(12) + c = 56
  • (144a + 12b + c =56)

<u><em>The first two equations</em></u>

9a + 3b + c = 15.5      | x -1

+ 49a + 7b + c = 23.5

-9a - 3b - c =-15.5

+ 49a + 7b + c = 23.5

= 40a + 4b = 8/4

= 10a + b = 2

<u><em>The second and third equations</em></u>

49a + 7b + c = 23.5     | x -1

+ 144a + 12b + c = 56

-49a - 7b - c = -23.5

+ 144a + 12b + c = 56

= 95a + 5b = 32.5/5

= 19a + b = 6.5

<u><em>Now, we solve for a, b, and c</em></u>

10a + b = 2    | x -1

+ 19a + b = 6.5

-10a - b = -2

+ 19a + b = 6.5

= 9a = 4.5/9

= a = 0.5

10(0.5) + b = 2

5 + b = 2    | -5

= b = -3

49(0.5) + 7(-3) + c = 23.5

24.5 - 21 + c = 23.5

3.5 + c = 23.5     | -3.5

c = 20

<u><em>Then, plug it into the equation</em></u>

c(x) = 0.5x^2 - 3x + 20

c(x) = 0.5(5)^2 - 3(5) + 20

c(x) = 12.5 - 15 + 20

c(x) = 17.5

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Which angle measures are correct? Select three options. mAngle2 = 125° mAngle3 = 55° mAngle8= 55° mAngle12 = 100° mAngle14 = 100
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Answer:

<em>m<2  = 125°, m<8 = 55° and m<14 = 100°</em>

Step-by-step explanation:

The question is incomplete.

<em>Lines e and f are parallel. The mAngle9 = 80° and mAngle5 = 55°. Parallel lines e and f are cut by transversal c and d. All angles are described clockwise, from uppercase left. Where lines e and c intersect, the angles are: 1, 2, 4, 3. Where lines f and c intersect, the angles are 5, 6, 8, 7. Where lines e and d intersect, the angles are 9, 10, 12, 11. Where lines f and d intersect, the angles are 13, 14, 16, 15. Which angle measures are correct? Select three options. mAngle2 = 125° mAngle3 = 55° mAngle8= 55° mAngle12 = 100° mAngle14 = 100</em>

Given

m<9 = 80°

m<5 = 55°

From the diagram, m<5+m<6 = 180°

Substitute m<5 = 55° into the formula, to get m<6

55+m<6 = 180

m<6 = 180-55

m<6 = 125°

From the diagram m<6 = m<2  = 125° (corresponding angles)

<em>Also on line e</em>, m<9 = m<12 = 80° (vertically opposite angles)

On line f, m<14+m<16 = 180° and m<12 = m<16 = 80

m<14+80°  = 180°

m<14 = 180-80

m<14 = 100°

<em>Also on line f</em>, m<5 = m<8 (vertically opposite angles)

Since m<5 = 55°, m<8 = 55°

Also on line e, m<10 + m<12 = 180

Since m<2 = m<10 = 125° (corresponding angle)

To get m<12,

125+m<12 = 180

m<12 = 180-125

m<12 = 55°

Also m<10 = m<14 = 125° (corresponding angle)

On line e, m<10 = m<11 = 125°  (vertically opposite angle)

Also on line e, m<3 = m<11 (corresponding angle)

This shows that m<10 = m<11 = m<3 = 125°

<em>From the above calculation the angle measure that are correct are:</em>

<em> m<2  = 125°, m<8 = 55° and m<14 = 100°</em>

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