Question

what is the value of x? (x + 40)° (3x)° 20 35 60 70

Explanation:

Step1: Identify angle - relationship

The angles $(x + 40)^{\circ}$ and $(3x)^{\circ}$ are vertical angles. Vertical angles are equal.
So, $x + 40=3x$.

Step2: Solve the equation for x

Subtract $x$ from both sides:
$40 = 3x - x$.
$40=2x$.
Divide both sides by 2:
$x=\frac{40}{2}=20$.

Answer:

20