Someone please help me on this I'm unsure if my answer is correct

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Find the slope of the line passing through a pair of points

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