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ololo11 [35]
3 years ago
5

*15 points* will give brainliest

Mathematics
1 answer:
kirill [66]3 years ago
6 0

Answer:

maybe 70

Step-by-step explanation:

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When a number is decreased by 20% of itself, the result is 128. what is the number?
andriy [413]
The number was 160 because 5/4•128=160. 5/4 represents inverting 80% and multiplying it by the number to determine how the result became 128. For checking over all you have to do is do 4/5 or 80%•160 which shall give you 128.
4 0
3 years ago
If the angle of elevation of the sun is 61.7° when a building casts a shadow of 56.5 feet, what is the height of the building ro
maksim [4K]

SOLUTION

Let us use a simple diagram to interprete the question

In the diagram above, the dark stuff below represents the shadow and the rectangular bar represents the building. I have labelled the height of the building as h.

So we will use the right-angled triangle formed to find h

As we can see h represents the opposite side and 56.5 feet represents the adjacent side of the right-angle triangle. So we will use TOA

\text{TOA tan }\theta=\frac{opposite}{\text{adjacent}}

So we have

\begin{gathered} \text{ tan }\theta=\frac{opposite}{\text{adjacent}} \\ \text{ tan }61.7\degree=\frac{h}{56.5} \\ 1.8572015=\frac{h}{56.5} \\ \text{cross multiplying, we have } \\ h=1.8572015\times56.5 \\ h=104.931887 \end{gathered}

Hence the answer is 104.9 feet to the nearest tenth

4 0
9 months ago
Aniii geometry . solve the equation 4x-6=34
prohojiy [21]
(1) You can see that the 6 is being added to both sides.

You are trying to make both sides equal by adding 6, so it would be the Addition Property of Equality. 

(2) 4 is being divided into both sides. 

It would be the Division Property of Inequality. (you are dividing by 4 to make both sides equal)

"B" is the answer.

I hope this helps!
~kaikers
4 0
3 years ago
3. Which situation is best described by the graph shown?
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There is no graph doe ...
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Answer:

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2 years ago
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