The table gives a car dealers weekly sales for the first 26 weeks of a year. the mean number of cars sold per week is

The mean is the average of the numbers. Therefore, to get the mean you would add the total number of cars sold by the number of weeks. After you get the total number of cars, which is 130, you divide that by the number of weeks the cars were being sold, 26, and you get the final answer of 5 cars sold per week.

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!