Question

Find the value of xOptions are 110, 80, 35, 40

Answer 1

The sum of all angles in a triangle is 180º. Therefore:

`\begin{gathered} 180=\text{ 30 + \lparen3x-10\rparen + x} \\ 180=\text{ 30 +3x -10 + x} \\ 180\text{ = 20 + 4x} \\ 180\text{ - 20 = 4x} \\ 160=\text{ 4x} \\ \\ (160)/(4)=\text{ x} \\ \\ 40=\text{ x} \end{gathered}`

X will be 40º.