Natalie and Jennie are working on a gardening project at school Natalie’s class spent $86 on 2 small trees and 7 flowering shrubs. Jennie’s class spent $104 on 8 small trees and 4 flowering shrubs. Find the cost of one small tree and the cost of one flowering shrub.

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.