Which value for x makes the sentence true? 9x= 4x+ 25

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

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

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps