How do I solve for 19-2(x-7)?

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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

Rewrite so the subject can be y in the formula d=m-y/y+n