Convert the map to scale to a unit rate. how many inches represent one mile? show your work. interpret the meaning of a unit rate. 3/10 in = 7/8 mi me i am desperate i am stuck and i really need

Could somebody me with this radical simplification?

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.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?