Explain the difference between using a closed circle and an open circle in the graph of an inequality

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

Suppose a store sells an average of 80 cases of soda per day. assume that each case contains 24 cans of soda and that the store is open 10 hours per day. find the average number of soda that the store sells per hour.

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount