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densk [106]
2 years ago
7

HELPPP PLEASEEEEEE!!!!!!!!!1

Mathematics
1 answer:
salantis [7]2 years ago
7 0

Hi!

We can see the river is a straight line.

This means that the angles that fall upon it are supplementary angles, and will add up to 180 degrees.

Therefore:

x+2x+21=180

Combine like terms:

3x+21=180

Subtract 21 from both sides:

3x=159

Divide both sides by 3:

x=53

Therefore, the value of x is 53 degrees.

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