Anyone mind helping?

What’s the domain of this function? fastttt

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

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship