Please help ASAP 40 pts!

x = 80

Step-by-step explanation:

We know the sum of the angles of a triangle is 180

x+y+z = 180

Since this is an isosceles triangle y=x

x +x + z = 180

We also know that x = 4z

Writing this in terms of x since we want to find angle x    

z = 1/4x

x+x+1/4x = 180

Combine like terms

2x +1/4x = 180

Multiply each side by 4 to get rid of fractions

4(2x +1/4x) = 180*4

8x +x =720

9x = 720

Divide by 9

9x/9 = 720/9

x = 80

C) 80

Step-by-step explanation:

Let the base angles be 4x

Vertex would be x

Total angle in a triangle = 180

x + 4x + 4x = 180

9x = 180

x = 20

4x = 80

ur mom gae

Step-by-step explanation: