Pls pls pls help me with the two ratio questions

If n stands for number sold and c stands for cost per item, in which column would you use the formula: ? a. column d c. column f b. column e d. column g

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true

Billy plotted −3 4 and −1 4 on a number line to determine that −3 4 is smaller than −1 4 is he correct? explain why or why not?