3(-5+2x) =21, 15 + 2x=21 is this distributed right?

Mathematics

1 answer:

hjlf3 years ago

3 0

Answer:

Step-by-step explanation:

3(-5+2x)=21

-15+6x=21 -5*3 is -15

6x=36

x=6

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Simplifying
10 + 5x = 5x + 10

Reorder the terms:
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Add '-10' to each side of the equation.
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1. Remember that the perimeter is the sum of the lengths of the sides of a figure.To solve this, we are going to use the distance formula: $d= \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2}$
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$(x_{1},y_{1})$ are the coordinates of the first point
$(x_{2},y_{2})$ are the coordinates of the second point
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We know form our graph that the coordinates of our first point, W, are (1,0) and the coordinates of the second point, Z, are (4,2). Using the distance formula:
$d_{WZ}= \sqrt{(4-1)^2+(2-0)^2}$
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$d_{XW}= \sqrt{13}$

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where
$s$ is the length of the arc.
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$\alpha$ is the central angle in radians

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$s=r \alpha$
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