what is the difference between estimating both of the factors, and then multiplying to find the answer, or just finding the actual answer, and then estimating it?

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

For how answer my question this will be the last question can you answer in math subject

If the class was going to get a class pet and 5 picked fish and 7 pick bird and 8 picked rabbits have many students were in the