I need help:") write a rule thats expresses D as a function of T and R

1. what is the measure of ∠abc? what is the measure of ∠abd?

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

Adriveway is 40 yards long about how many meters long is it