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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

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)

Aline passes through the point (–7, 5) and has a slope of 1/2 which is another point that the line passes through?