Can someone help me with my homeworkk

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

What will the graph look like for a system of equations that has no solution? a. the lines will be perpendicular. b. the lines will cross at one point. c. both equations will form the same line. d. the lines will be parallel.

Astocks price gained 3% in april and 5% in may and then lost 4% in june and 1% in july during which month did the stocks price change the most