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netineya [11]
3 years ago
12

The triangles are similar by the AA Similarity Postulate. Find the value of X.

Mathematics
1 answer:
julsineya [31]3 years ago
4 0

Answer:

<h2>x = 12</h2>

Step-by-step explanation:

If the triangle are similar, then the sides are in proportion:

\dfrac{x}{18}=\dfrac{15}{15+7.5}

\dfrac{x}{18}=\dfrac{15}{22.5}         <em>cross multiply</em>

22.5x=(18)(15)

22.5x=270            <em>divide both sides by 22.5</em>

x=12

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Answer:

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i         a_{i}

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b) The algebraic expression for the general term of the sequence is a(i) = 6 + 5\cdot (i - 1).

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Step-by-step explanation:

a) Make a table of values for the sequence 6, 11, 16, 21, 26, ...

The table of values represents the ordered pairs formed by the elements of the sequence (a_{i}) (range) and their respective indexes (i) (domain):

i         a_{i}

1         6

2        11

3        16

4        21

5        26

b) Based on the table of values, we notice a constant difference between two consecutive elements of the sequence, a characteristic of arithmetic series, whose form is:

a(i) = a_{1} + r\cdot (i - 1) (1)

Where:

a_{1} - First element of the sequence.

r - Arithmetic difference.

i - Index.

If we know that a_{1} = 6 and r = 5, then the algebraic expression for the general term of the sequence is:

a(i) = 6 + 5\cdot (i - 1)

c) If we know that a(i) = 6 + 5\cdot (i - 1) and i = 25, then the 25th term in the sequence is:

a(25) = 6 + 5\cdot (25 - 1)

a(25) = 126

The 25th term in the sequence is 126.

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