Todd and his friends are painting 5 equal sections of a wall. The wall is 10 feet tall but its length is unknown. Each section will be a different color, so they need to know the area if each section. Write a expression for the total area of the wall. Explain how you came up with your expression.

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.