Its it a. c or d thanks for helping me ​

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

Which representation has a constant of variation of -2.5

The trigonometric ratios sine and secant are reciprocals of each other