Students were asked to choose their favorite subject and 7/9 chose either history or biology. If 5/9 students chose history, what fraction chose biology?

Can someone me with this problem . show your work .

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

Write the expression as a single natural logarithm. 2 in a - 4 in y