Prove using coordinate geometry: The midpoints of the sides of a rhombus determine a rectangle.

What is the y intercept of f(x)=(1/2)^x?

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5

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.