CAN you please help me with this?

Which formula gives the area of a triangle? a=1/2(b+h)

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

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