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Deffense [45]
3 years ago
5

5x-3(2x+7) and then evaluate if x=-2

Mathematics
1 answer:
Kamila [148]3 years ago
8 0

Answer:

-19

Step-by-step explanation:

5x-3(2x+7) and then evaluate if x=-2

5(-2)-3(2(-2)+7)=

-10-3(-4+7)=

-10+12-21

2+-21

-19

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No sé, prueba 2,3,5,7,11,13....
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The decimal number 11.8 can be read as "eleven and eight tens."<br><br><br> True or False
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I mean it could be read that way but that's the way most people read fractions. 11 and 8/10. Most people I know read decimals like that as 11 point 8. So yes I suppose it's true; it's not wrong, but most people don't say it like that. And I don't know how they taught you to read it in your math course.
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there should be a pic or a diagram  

Step-by-step explanation:

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The radius of a semicircle is 17 millimeters. what is the semicircle's perimeter?
Maksim231197 [3]

Answer:

87.407

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2 years ago
Solve each system of equations by showing the process of substitution.
bekas [8.4K]

Answer:

A. {x,y}={-2,-3}

// Solve equation [2] for the variable  x

 [2]    x = 2y + 4

// Plug this in for variable  x  in equation [1]

  [1]    (2y+4) - y = 1

  [1]    y = -3

// Solve equation [1] for the variable  y

  [1]    y = - 3

// By now we know this much :

   x = 2y+4

   y = -3

// Use the  y  value to solve for  x

x = 2(-3)+4 = -2

B.   [1]           3x=3y-6

 [2]           y=x+2

Equations Simplified or Rearranged :

  [1]    3x - 3y = -6

  [2]    -x + y = 2

Solve by Substitution :

// Solve equation [2] for the variable  y

 [2]    y = x + 2

// Plug this in for variable  y  in equation [1]

  [1]    3x - 3•(x +2) = -6

  [1]    0 = 0 =>  Infinitely many solutions

C.Step by Step Solution

More Icon

System of Linear Equations entered :

  [1]    4x - y = 2

  [2]    8x - 2y = 4

Solve by Substitution :

// Solve equation [1] for the variable  y

 [1]    y = 4x - 2

// Plug this in for variable  y  in equation [2]

  [2]    8x - 2•(4x-2) = 4

  [2]    0 = 0 =>  Infinitely many solutions

3 0
2 years ago
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