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Black_prince [1.1K]
3 years ago
8

What number is 164,502,423 decreased by 100,000

Mathematics
1 answer:
valentinak56 [21]3 years ago
8 0
If we decrease 164,502,423 by 100,000 we get <em>164,402,423</em>

164,502,423 - 100,000 = <em>164,402,423</em>
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3 years ago
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You can use the fact that lighthouses are usually standing perpendicular to the ground that smaller distance on earth surface(planes or water bodies like sea or ocean or calm river) acts as if they a straight plane.

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<h3>What is angle of elevation?</h3>

What you see something higher than your eye level height, you need to see up, you elevate your head to see that thing. The angle from the straight horizontal level of eye to the current elevated level is measured and named as angle of elevation.

Similarly, there is angle of depression when the observer looks down.

<h3>How to calculate the height of the considered lighthouse?</h3>

See the figure attached below to understand the symbols used in calculations.

Let the boat is on point C, and let the light house be AB.

Then we have:

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To find: length of AB

By using the trigonometric ratio tangent, we get:

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Since here h is denoted by y, we have h = y, or

The equation to find the height of the lighthouse is

tan(40^\circ) = \dfrac{y}{120}

Thus,

The length (y) of the lighthouse is given by:

Option D:  tan 40° = y over 120.

Learn more about angle of elevation here:

brainly.com/question/12483071

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2 years ago
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<h3><u>Explanation</u></h3>
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Therefore, we have to make x-term as the subject of equation. Currently c-term is the subject of equation.

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Isolate x and we get the answer.

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