What is the value of the following expression when x = 3 and y = -3

On a piece of paper graph f(x)=5•(0.4)^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

Find the distance from the theater to the library. leave your answer in simplest radical form if necessary. 12 √12 74 √74