If the data represented by the graph is normally distributed, what are the endpoints of the middle 68% of the d --1.8 0.4 7 A. -infinity and +infinity DB. -1.8 and 11.4 c. 0.4 and 9.2 D. 2.6 and 7​

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.