Please help, solve for x

Perform the required operations on the following functions given: f(x)= 3-x; g(x)= -2x find g[f(x)]

Use set buikder notation to represent the following set: {, -2, -1, 0}

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?