Kara and her friend Niki are knitting scarves for the homeless. Kara had already completed 20 scarves and has committed to making & more scarves per day. Niki,
who has completed & scarves, has more free time and can make 9 scarves per day.
At some point, Naomi will catch up and they will both have completed the same
number of scarves. How many scarves will each woman have finished? How long
will that take?

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.