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4 years ago

8

Helpppppppppppppppppppp solve for x

1 answer:

eduard4 years ago

5 0

Answer:

x=35

Step-by-step explanation:

Since a quadrilateral's interior angles add up to 360°, we get this:

360-85-20=360-4x+x

340-85=360-3x

255=360-3x

-105= -3x

<em>Multiply both sides by -1</em>

105=3x

3x=105

<em>Divide both sides by 3</em>

x=35

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