Would you mind helping me? :) attached document

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

Consider the function represented by the equation 1/2 j + 1/4 k equals 3 which shows the equation written in function notation with j as the independent variable

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet