I dont know the answer please help me

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

Triangle knm is what is true about the sides of knm

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).