Help ? Please it will be appreciated

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

Reflect the point (7,0) across the y-axis

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?