Which recursive sequence would produce the sequence 6, -15, 48, ...?

The water has been on the stove y=9.5x+62.1 after how many minutes will the tempature be 138.1 f

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?