4. If two segments have lengths a inches and b inches, what is the length of the segment which is their mean proportional?​

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

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.

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.