Solve using substitution, y=2x+5 y=6x+1

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 f(x) = 2x + 2 and g(x) = x? , what is (gºf)(2)?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.