The equation of a circle is x2 + y2 + 6x + 4y + 10 = 1. what is this equation written in its standard form? a) (x + 3)2 + (y + 2)2 = 4 b) (x + 6)2 + (y + 4)2 = 4 c) (x + 6)2 + (y + 4)2 = 10 d) (x + 3)2 + (y + 2)2 = 10

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.