Find the value of n

Can you guys help me??

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

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Find the domain and range of the following function f(x) = 51x - 21+ 4