Determine whether the graph is that of a function. an open dot indicates that the point does not belong on the graph. is the graph the graph of a function?

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

Aretha wanted to gather data about the cost of local bowling leagues in her area. she plotted the data and determined that the average bowling league costs consist of a one-time registration fee and a monthly fee modeled by the equation y = 15x + 20. identify and interpret the y-intercept in this model. the y-intercept is 20. this is the cost per month. the y-intercept is 20. this is the cost of registration. the y-intercept is 15. this is the cost of registration. the y-intercept is 15. this is the cost per month.

Having a hard time understanding this question (see attachment).