Question

Please help me on this!

Answer 1

`s=20`

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`