Does anybody know the answer??

What term makes it inconsistent y=2x - 4

The square root of 9x plus 7 plus the square rot of 2x equall to 7

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