Two people are sitting 15ft apart on a seesaw. one person weight 180lbs. the second person weight 120lbs. how far from 180bls persons should the fulcrum be placed so the seesaw balance?

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.

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Which is the scale factor proportion for the enlargement shown?