2/12 of a box of pencils are red.4/12 are green. 5/12 are blue. the rest are yellow. what fraction is yellow?

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

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

We just started the introduction into circles and i have no idea how to do this.