3(x+4)=-18 Please go step by step!

Compare the cost of the bike trips from the two companies shown.for both the cost in a linear function of the number of days which statements is true

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

Can some one me with these questions