The following table shows the monthly defect rate for a product at a manufacturing company. month 1 2 3 4 5 6 7 8 9 10 11 12 number of defects (per 1,000 units) 18 21 22 25 28 25 24 18 20 21 26 28 the production manager is going to present this information to the company's board of directors. which graph should the manager use to best emphasize that the number of defects has remained relatively consistent throughout the year?

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.