HA Leonardo le compraron 3 libros por su cumpleaños. Si por dos se pagaron 760 y la cuenta fue de 1125 cuanto costó el tercer libro​

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126

Having a hard time understanding this question (see attachment).

Find the measure for the angle indicated in bold