Solve the system of equations. 5x−4y=−10 -4x + 5y = 8

If a baby uses 15 diapers in 2 days, how many diapers will the baby use in a year?

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

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)