SOLUTION:
We are to find the degree measure of each angle in the traingle;
< A + < B + < C = 180
Since the triangle is an isosceles triangle, m< A = m< C
(4x + 4 ) + (5x + 29 ) + (4x + 4 ) = 180
4x + 4 + 5x + 29 + 4x + 4 = 180
13x + 37 = 180
13x = 180 - 37
13x = 143
x = 143 / 13
x = 11
m < A = 4x + 4 = 4(11) + 4 = 44 + 4 = 48 degrees.
m < B = 5x + 29 = 5(11) + 29 = 55 + 29 = 84 degrees.
m < C = m < A = 48 degrees.