sixty-two percent of pet owners say they consider their pet to be their best friend. you randomly select 12 pet owners and ask them if they consider their pet to be their best friend. find the probability that the number who say their pet is their best friend is (a) exactly nine, (b) at least eight, and (c) at most three.

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.