A publishing company's cost, in thousands of dollars, is represented by the function C(x)=x+3200 and its revenue, in thousands of dollars, is represented by the function R(x)=3x. Each book is represented by x. 1000 books sold

Really need on these. i have no idea what to do

Given the following statements, which is the best

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students