Im stuck on this question

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

Find the quotient. 50a2 – 98b2 -5a +7b

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