Place the following steps in order to complete the square and solve the quadratic equation, x^2-6x+7=0

Ihonestly have no clue if it's each or none.

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

How can you check that you have correctly converted frequencies to relative frequencies?