If 8x -2=-9+7x, what is the value of 4x-4?

What is the approximate total length of iron edging needed to create the square frame and the two diagonals?

The amount of energy it takes to lift a box might be a function of which of the following

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