Answer my math question I asked so many times I lost most of points by

How can you find the conditional probability of a given b as the fraction of b’s outcomes that also belong to a, and interpret the answer in terms of the model? i just need a good explanation

Find the zeros of the function. write the smaller solution first, and the larger solution second f(x)= (x+6)^2-49

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie