An oil barge is docked on the Southern coast of Texas. From the dock, two oil platforms are within near proximity. Oil platform A is located 1.4 miles S 22° W from the dock. Oil platform B is situated 3.4 miles S 56° E from the dock. How far apart are the two oil platforms?

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.