Pls help solve for x

Iam not sure how to turn that into an equation first of all so I don't get it.

Janet is rolling a number cube with the numbers one through six she record the numbers after each row if she rolls of keep 48 times how many times should she expect to roll a 4

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if