brianaxxxx
Answered

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Not sure how to do this plz help


Not Sure How To Do This Plz Help class=

Sagot :

livia68

Answer:

x=20

Step-by-step explanation:

the sum of the angles of a triangle is always 180, so we can set up an equation using these angles.

31+90+3x-1=180

collect like terms: 120+3x=180

subtract 120 from both sides

3x=60

divide both sides by 3

x=20

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