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BigorU [14]
3 years ago
15

MAY SOMEONE HELP PLZ!

Mathematics
2 answers:
JulijaS [17]3 years ago
6 0

Answer:

First pic

ratio =  \frac{62.8}{2 0}  \\  = 3.14

Second pic

< c  + 2x + (3x + 10) = 180 \\  < c = 180 - 3x - 10 - 2x \\  < c = 170 - 5x

Kruka [31]3 years ago
3 0

Answer:

Step-by-step explanation:

<h3>#1</h3>

<u>Circumference equation:</u>

  • C = πd

<u>Circumference to diameter ratio is:</u>

  • C/d = π = 3.14
  • Same result comes from the table
  • Correct choice is B
<h3>#2</h3>

<u>Sum of angles of a triangle is 180°</u>

  • m∠A + m∠B + m∠C = 180°

<u>A and C are equal angles as opposite sides are congruent.</u>

  • 2(3x + 10) + 2x = 180
  • 6x + 20 + 2x = 180
  • 8x = 160
  • x = 20
  • m∠C = 3*20 + 10 = 70°

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Find x, y and ab and how to check if the answer is right ​
iris [78.8K]

Answer:

  x = 2, y = -2, AB = 142

Step-by-step explanation:

The fact that X is the midpoint gives you two relations:

  AX = XB

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Since you have two unknowns, this number of equations is sufficient to find their values. Substituting the given expressions in the above equations, you have ...

  • 8(3x+5) -3(y-7) -22x = 5x +y +23 -4(x-12)
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Simplifying the first of these can make simplifying the second one easier.

  24x +40 -3y +21 -22x = 5x +y +23 -4x +48

  2x -3y +61 = x +y +71 . . . . . . we can use this simplification

  x -4y = 10 . . . . . . . . . . . . . . . . subtract x+y+61

Now, we can simplify the second equation to ...

  2x -3y +61 +x +y +71 = 2x -5y +128

  3x -2y +132 = 2x -5y +128 . . . . . simplify the left side

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  -7y = 14

  y = -2

Substituting into the first of these simplified equations, we get

  x -4(-2) = 10 . . . . substitute for y

  x +8 = 10 . . . . . . .evaluate

  x = 2 . . . . . . . . . .subtract 8

So, the solution is (x, y) = (2, -2).

Now, the values of AX and XB are ...

  AX = 2x -3y +61 = 2·2 -3(-2) +61 = 71

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  AB = 2x -5y +128 = 2·2 -5(-2) +128 = 142 . . . . = AX+XB, another good sign

The desired values are x = 2, y = -2, AB = 142.

_____

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