Can someone explain how to do this for like 20 points??

What is (28 + 7 + 6 + 3) x 1/2 show your work

Evaluate the following expression 1/3^2

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