Question 223445
Let the vertex angle be x degrees, then each base angle is 2x-10, and the sum of these three angles is 180 degrees, so...
(2x-10)+(2x-10)+x = 180 Combine the like-terms.
5x-20 = 180 Add 20 to bothe sides.
5x = 200 Divide both sides by 5.
x = 40 degrees.
2x-10 = 70 degrees.
The three angles are:
Vertex angle = 40 degrees.
The base angles are each 70 degrees.