I can't really understand the whole concept of isosceles, can someone help me out??

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.

When is g(x) = 0 for the function g(x) = 5.23x + 4?

Consider the equation 0.2(x – 4.5) + 1.7 = 9.6. 1. use the distribution property. 2. combine like terms. 3. use the properties of equality and inverse operations to isolate the variable. 0.2x + (-0.9) + 1.7 = 9.6 0.2x + 0.8 = 9.6