The contents of a cell in a spreadsheet are shown below. 8.2111148e-5 what number do the contents of the cell represent? a. 8.2111148 × 104 b. 8.2111148 × 10-6 c. 8.2111148 × 10-5 d. 8.2111148 × 105

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.