Khảo sát sự biến thiên và vẽ đồ thị hàm số y=-x^2-4x+1

Given f(x) = 17-x^2what is the average rate of change in f(x) over the interval [1, 5]?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

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.