As the weight of purchased items increases, the shipping charges increase, as shown in the table below. weight, in oz total shipping cost not more than 5 $9.50 more than 5, not more than 10 $13.25 more than 10, not more than 15 $17.00 more than 15, not more than 20 $20.75 assuming only positive domain values, which statement is true of the graph that represents the total cost, y, in dollars for shipping items that weigh x ounces? the graph is discontinuous at x = 5, x = 10, and x = 15. the range values for the set of the data are 10, 14, 17, and 21. for every 1-ounce increase in weight, the total shipping cost increases by $3.75. the left side of each horizontal interval is a closed circle, and the right side is an open circle.