Only questions 2,3 and 4 please and thank you :)

6.3x+14 and 1.5x-6 answer in simplified form

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.

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me