Does 9, 13, 16 make a right triangle

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

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