If it is false, give a counterexample. if true use properties of real numbers to show the expression are equivalent. For all real numbers R, S and T, (R•S) • t = t • (S•R)
i just needed a step by step and you can give me a examples of these

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x

What value of x is in the solution set of 4x – 12 s 16 + 8x?

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.