Question

Question was provided via image upload.

Explanation:

Step1: Recall angle - sum property of triangle

The sum of interior angles of a triangle is 180°. So, $35^{\circ}+70^{\circ}+x = 180^{\circ}$.

Step2: Simplify the left - hand side

$35 + 70+x=105 + x$. So, $105+x = 180$.

Step3: Solve for x

Subtract 105 from both sides: $x=180 - 105$.
$x = 75^{\circ}$.

Answer:

$75^{\circ}$