Which step has the incorrect instruction?

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

Cole says the distance between points (-5,0) and (0,-5)is 5 units. is he correct? explain why or why not.

B. two events are dependent if the occurrence of one event changes to occurrence of the second event. true or false