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.

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Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?