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Vinil7 [7]
3 years ago
13

This is an excerpt from a letter written by a soldier fighting in World War I and

History
1 answer:
e-lub [12.9K]3 years ago
5 0

Answer:

O A. Trenches were used extensively in World War I.

Explanation:

Trenches are long and narrow pathways dug out to allow the passage or movement of soldiers during wars. They are dug out as hiding places, movement from one side to another while also helping in shielding the soldiers from enemy fire.

In the soldier's letter to his mother, he describes how the <em>"trenches stretch for miles"</em>. And even though they cover miles of land, they (soldiers) are unable to move in fear of being shot at. This is why they must be alert and be patient, or they will get shot at any time they make any movement.

The <u>statement that best represents the main idea of this source seems to be that trenches were used extensively during the First World War.</u>

Thus, the correct answer is option A.

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14. W<span>hat is the center and radius of a circle with the given equation?
</span><span>x2</span>+4x+<span>y2</span>−10y−7=<span>0

</span>Move all variables to the left side and all constants to the right side.<span><span>x2</span>+4x+<span>y2</span>−10y=7+<span>0

</span></span>Add <span>77</span> and <span>00</span> to get <span>77</span>.<span><span>x2</span>+4x+<span>y2</span>−10y=<span>7

</span></span>Complete the square<span> for </span><span><span><span>x2</span>+4x</span><span><span>x2</span>+4x</span></span><span>.
</span><span><span>(x+2)</span>2</span>−<span>4
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Substitute <span><span><span><span>(x+2)</span>2</span>−4</span><span><span><span>(x+2)</span>2</span>-4</span></span> for <span><span><span>x2</span>+4x</span><span><span>x2</span>+4x</span></span> in the equation <span><span><span>x2</span>+4x+<span>y2</span>−10y=7</span><span><span>x2</span>+4x+<span>y2</span>-10y=7</span></span>.<span><span><span>
(x+2)</span>2</span>−4+<span>y2</span>−10y=<span>7

</span></span>Move <span><span>−4</span><span>-4</span></span> to the right side of the equation by adding <span>44</span> to both sides.<span><span><span>(x+2)</span>2</span>+<span>y2</span>−10y=7+<span>4

</span></span>Complete the square<span> for </span><span><span><span>y2</span>−10y</span><span><span>y2</span>-10y</span></span><span>.
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</span></span>This is the form of a circle. Use this form to determine the center and radius of the circle.<span><span><span>(x−h)</span>2</span>+<span><span>(y−k)</span>2</span>=<span>r<span>2

</span></span></span>Match the values in this circle to those of the standard form. The variable <span>rr</span> represents the radius of the circle, <span>hh</span> represents the x-offset from the origin, and <span>kk</span> represents the y-offset from origin.<span><span>r=6</span><span>r=6</span></span><span><span>h=−2</span><span>h=-2</span></span><span>k=<span>5

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3 years ago
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