The cafeteria at school offers pizza thick (K) or thin (N) crust with pepperoni (P) , sausage (S) or extra cheese (E). The tree diagram for the offerings is shown.

In the football stadium, there are 18 empty seats out of 360 total seats. (1a) write the ratio of empty seats to total seats as a fraction in simplest form. (1b) then explain its meaning.

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20