Explain your work, please please, i beg you to help. i just need you to explain how it is the answer.

40 points.

Which formula finds the probability that a point on the grid below will be in the blue area? p(blue) = total number of squares number of blue squares number of blue squares p(blue) = total number of squares number of blue squares p(blue) = number of white squares

What is the sum of these mixed numbers 2 1/8 + 4 3/8

What is the 12th term of b(n)=-4-2(n-1)