Can someone tell me I’m correct or correct me please that would be lovely

Can someone me with this problem i don't understand i need

Which value would be a solution for x in the inequality 47-4x< 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