Identify the constant in the expression, a +3b-18

Which shows the image of rectangle abcd after the rotation (x, y) → (–y, x)?

What is the celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

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