The sum of the measures of the angles of a triangle is 180. the sum of the measures of the second and third angles is five times the measure of the first angle. the third angle is 14 more than the second.

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.

Which of the following represents the length of a diagonal of this trapezoid?

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)