Which expressions apply to 15x+39?

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent and the median amount spent? 40 25 8 36 18 15 24 27 43 9 12 19 22 34 31 20 26 19 17 28

I’m still confused on how to work the percentages