Here are 5 more questions, please help

1. are the triangles similar and if so why? what is the value of x? show your work.

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2