Please help me I havent found answers any where and dont know how to do this. Help me please. I have posted this once and it seems to be very compcated. 30 okay P O I N T S​

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

Enter numbers to write 0.000328 0.000328 in scientific notation. 1 1 0.000328=3.28 × 0 . 000328 = 3 . 28 × =3.28×10 = 3 . 28 × 10

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"