Barty has 70 balloons, and he will pop four of them every second. Fill in the missing information on the table, it relates b, the number of balloons he has left, to t, the time in seconds. Then, write a sentence answering why this is or isn't a proportional relationship.

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.