Seven times a number plus three times the same number is subtracted from 7

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 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

Find the values of y: 3y^3(y^2+ 2/3y)=0