Please put any weight . it doesn’t really matter what weight you use

Find the measures of the complement and the supplement of each angle, m

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning