Whats the greatest number of cross sections?

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

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?