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3 years ago

2x + 5y= 18 4x + 20y= -36 Solve and Explain first to get right gets brainliest

Mathematics

1 answer:

Jet001 [13]3 years ago

4 0

because 4x+20y=-36,so ( 4x+20y)/2=2x+10y=-18

(2x+10y)-(2x+5y)=-18-18

5y=-36

then y=-7.2

because 2x=18-5y

so x=(18-5y)/2=(18-5*(-7.2)）/2=27

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Step-by-step explanation:

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Other having diameter of 4 inches i.e. AC

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Area could be computed using the same way.

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As the circumference of the smaller circle is 2π in. Cutting it half would yield the circumference of the smaller semi-circle i.e. π.

As the circumference of the bigger circle is 4π in. Cutting it half would yield the circumference of the bigger semi-circle i.e. 2π.

As the length of the segment DC is 2 in.

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Area could be computed using the same way as we did during measuring perimeter.

As the area of circle is

$A={\displaystyle \pi.r^{2}$

As we are dealing with semi-circles. So, cutting the diameters of two semi-circles in half can let us find the radii of them.

So,

Smaller semi-circle has 1 in radius
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Areas would have to be cut in half as well, as we are dealing with semi-circles.

So,

For smaller:

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Hence, the area of smaller will be: π/2 in²

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Combining them together:

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Therefore,

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Keywords: radius, area, perimeter, semi-circle, circle, diameter, circumference of circle

Learn more about circle measurements from brainly.com/question/3855576

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