Nathaniel was given a gift card for a coffee shop. Each morning, Nathaniel uses the card to buy one cup of coffee. Let A represent the amount money remaining on the card after buying 2 cups of coffee. A graph of A is shown below. Write an equation for A then state the slope of the graph and determine its interpretation in the context of the problem

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.