How many distinct real number zeros does f have? f(x)=−4x 2 +12x−9

What aspects of lines have to be diffrent

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.

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.