Question

I needTo know if it’s A b c or D

Answer 1

10

Explanation:

We can calculate the value of x, knowing that the subtraction between the plane angle (180°) and 7x -10 is equal to 120°, therefore, we have the following equation:

`\begin{gathered} 180-\mleft(7x-10\mright)=120 \\ \text{ Solving for x} \\ 180-7x+10=120 \\ -7x=120-190 \\ x=(-70)/(-7) \\ x=10 \end{gathered}`

The value of x is 10