The points (-1,-9) and K(5.1) are endpoints of a diameter of circle S. Which equation represents circle S?
A. (x - 2)2 + (y + 4)2 = 34
B. (x - 2)2 + (y + 4)2 = 136
OC. (x + 2)2 + (y - 4)2 = 34
D. (x + 2)2 + (-4)2 = 136

Me because some of question i don’t understand

Can someone check if i did this correct. it’s number 4 if you’re wondering.

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.