Question

Please help me on this!

Answer 1

Answer:

$s=20$

Step-by-step explanation:

By the Exterior Angle Theorem, we know that the exterior angle is equal to the sum of the two, opposite interior angles.

In other words:

$4s=(3s-20)+(2s)$

Solve for s. Combine like terms:

$4s=5s-20$

Subtract 5s from both sides:

$-s=-20$

And divide both sides by negative one. Therefore:

$s=20$