Can someone show me the problems to 4/3 x 2/5 and 2/5 divided by 4/3

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

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?