I will mark brainiest! PLEASE SHOW ALL WORK! The age of Vania and Kennedy total 27 years. In 4 years, Kennedy's age plus twice Vania's age will be 43. What are Vania and Kennedy's ages?

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