Is the relation a function or no function?

Joanie watched 1 out of three of a movie in the morning

Which of the following is the graph of y= square root -x-3

Find the volume of the solid whose base is the region bounded by f(x), g(x) and the x-axis on the interval [0, 1], and whose cross-sections perpendicular to the y-axis are squares. your work must show the integral, but you may use your calculator to evaluate it. give 3 decimal places for your answe