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Romashka-Z-Leto [24]
3 years ago
15

What is the value of x is?

Mathematics
1 answer:
marin [14]3 years ago
3 0
The applicable theorem is the one that tells you the exterior angle is equal to the sum of the opposite interior angles.
  9x = (5x) +(9 +x)
  9x = 6x +9 . . . . . . . . collect terms
  3x = 9 . . . . . . . . . . . . subtract 6x
  x = 3 . . . . . . . . . . . . . divide by 3

The value of x is 3.

_____
The angles (clockwise from left) are then
  (9*3)° = 27°
  (5*3)° = 15°
  (9 +3)° = 12°
This is an obtuse triangle, obviously not drawn to scale.
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Step-by-step explanation:

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3 years ago
In an arithmetic series, the sum of the first 12 terms is equal to ten times the sum of the first 3 terms. If the first term is
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Answer:

Step-by-step explanation:

The formula for determining the sum of the first n terms of an arithmetic sequence is expressed as

Sn = n/2[2a + (n - 1)d]

Where

n represents the number of terms in the arithmetic sequence.

d represents the common difference of the terms in the arithmetic sequence.

a represents the first term of the arithmetic sequence.

If a = 5, the expression for the sum of the first 12 terms is

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Step-by-step explanation:

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