The average electricity bill for lynn’s home is $64.50 per month with a standard deviation of $8.20. in june she received a bill of only $30.00 because she was traveling for most of the month. how many standard deviations below the mean is the amount of lynn’s electricity bill for june? a.) 2.00 b.) 3.65 c.) 4.20 d.) 7.86

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.