Rotate the point (-9,5) 90 degrees counterclockwise about the origin. What are the coordinates of the new point? HURRY ITS TIMED QUIZ

Identify an equation in point slope form for the line perpendicular to y=3x+5 that passes through (4,-1)

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.

Math it's appreciated. (picture provided)