Plz answer 19. and 20. until friday it's due friday.

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

The parabola x= √y-9 opens: a.)up b.)down c.)right d.)left

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.