A speech class has nine freshmen and six sophomores. Three people are selected at random to give speeches in sequence. Find the probability that (a) the first is a sophomore, the second is a freshman, and the third is a sophomore. (b) all three are freshmen. (c) the first is a sophomore and the other two are freshmen.

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

14. (05.02 lc) what is the value of y in the solution to the following system of equations? (5 points) 2x + y = −4 5x + 3y = −6

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