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olga nikolaevna [1]
3 years ago
10

What is the value of x?

Mathematics
1 answer:
Mrrafil [7]3 years ago
5 0

Answer:

3

Step-by-step explanation:

Triangles with the same shape but different size are proportional. Proportional means that their side lengths form equal ratios. To solve for x, set up a proportion.

The ratios we will create will be \frac{long}{short} =\frac{long}{short} where each long and short are corresponding sides from each triangle.

So write:

\frac{4}{x} =\frac{3}{2.25}

To solve, cross multiply numerator with denominator.

4(2.25) = 3(x)

9 = 3x

3 =x

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Please Help!!! "What is the area of trapezoid ABCD? Enter your answer as a decimal or whole number in the box. Do not round at a
Alexxx [7]
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OverLord2011 [107]

Answer:

(r^2 - r - 1)(r^2 + r - 1).

Step-by-step explanation:

r^4 - 3r^2 + 1

We need to make this into  a perfect square so the r^4 and the  1  fit the bill but not the  -3r^2 so we have to correct for that.

A perfect square would be:

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(r^2 - 1)^2 - r^2

= (r^2 - 1 - r)(r^2 - 1 + r)

= (r^2 - r - 1)(r^2 + r - 1)

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