COMBINING LIKE TERMS

4x² 7+2x - 3x² + 8x - 6

Can someone please help me with this

If g(x) = x+1/ x-2 and h (x) =4 - x , what is the value of ( g*h) (-3)?

If 3x+8=3x+8 is it one solution or no solution

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.