If x, y,z are the exterior angles of ∆ABC then find x+y+z

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh

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.

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64