Find the center and radius of the circle given by this equation: x^2 - 10x + y^2 + 6y - 30 = 0

Me because some of question i don’t understand

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

Factor the polynomial by its greatest common monomial factor.