Which property is not used to simplify the following expression? (x+2) times 5-7=5(x+2)-7 =(5x+10)-7 =5x+(10-7) =5x+3 a) distributive property b) associative property of addition c) commutative property of multiplication d) commutative property of addition

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

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.