Answer:
x = 12
Step-by-step explanation:
The diagram shows an equilateral triangle (because all angles are congruent). All sides in equilateral triangle are congruent, so

Solve the equation

Check this value:

Thus, 
3.8, think of it as 78, which you would round to 80
Maybe 2.5 I guess I know that it says the answer is shown there check it out yourself
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