1. What is the exact area under the curve of f(x) = 2x – 4 from 0 to 8? 2. Approximate the area under the curve using twenty subintervals and left endpoint to the nearest hundredth, f(x) = cos⁡x, 0 ≤ x ≤ 4.

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.