A bottle of window cleaner is $3.99. It is on sale for 10% off and you can save an additional 5% using your credit card. What is the final cost including CT tax? (CT tax is 6.35%) Which is the correct answer?

a. $3.61
b. $3.62
c. $3.63
d. $3.97

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.