How do you write (negative infinity, 8)or (10, infinity) as inequality?

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 domain and range of the following function f(x) = 51x - 21+ 4

Write the function for the graph. (1.8) (0,4)