Below are two parallel lines with a third line intersecting them

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

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

Which expression is equal to (f+g)(x)?