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baherus [9]
3 years ago
15

How many triangles will be in the 5th set of triangles?

Mathematics
1 answer:
tia_tia [17]3 years ago
6 0

Answer:

25.

Step-by-step explanation:

I am assuming you only mean the small triangles, not the composite ones.

The  second  triangle set has 3 triangles on bottom row and 1 on the top - total 4.

The 3rd triangle set has 5 triangles on the bottom , 3 on the next up and 1 on the top  - total  9

Following the pattern 4th set will have the number of triaNGLES

7 + 5 + 3 + 1 = 16.

So the 5th will have 9 + 7 + 5 + 3 +1 = 25 triangles.

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Step-by-step explanation:

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Step-by-step explanation:

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Express the system in standard form:

{-(7 x)/5 + y = -5 | (equation 1)

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{-(7 x) + 5 y = -25 | (equation 1)

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Multiply equation 2 by 7/4:

{-(7 x) + 5 y = -25 | (equation 1)

{0 x+y = 2 | (equation 2)

Subtract 5 × (equation 2) from equation 1:

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Step-by-step explanation:

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