Modeling with mathematics the arch of the sydney harbor bridge in sydney, australia, can be modeled by $y=-0.00211x^2+1.06x$ y=−0.00211x2+1.06x , where $x$ x is the distance (in meters) from the left pylons and $y$ y is the height (in meters) of the arch above the water. for what distances $x$ x is the arch above the road? round your answers to the nearest whole number

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.