HELP PLEASE 5MIN LEFT

a 84
b 630
c 426
d 28

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

How is working backward similar to solving an equation?

Given: ∆mop p∆mop =12+4 3 m∠p = 90°, m∠m = 60° find: mp, mo