The variables are: time(the independent variable or (x) variable) and number of handbags (the dependent variable or (y) variable). The variables helps to plot an accurate points on the graph.
Answer:

Step-by-step explanation:
Consider the right side of the table
It informs us of the values for h(t) for different values of t
The top one informs us what h(t) is when t = 17, that is
h(t) =
, when t = 17, thus
h(17) = 
You have to multiply the price by the quantity and you will find the total cost.
1.43 * 22 = 31.46
(n - 2)*180
Therefore, (8 - 2)*180
Which equals to 6(180) or 1080
Hope this helps! :)