The vertex angle of an isosceles triangle measures 58 degrees. What is the measure of the external angleat the base of the triangle?

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.

Need plz been trying to do it for a long time and still haven’t succeeded