C =40+0.7yd, I= 60. what is the equilibrium level of income​

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

Don't know how to find x given these segment lengths

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.