What is the theoretical probability of choosing avowel in the word summer

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

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

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?