Fifth grade eureka math problems set module 2 lesson 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

Using the side-splitter theorem, daniel wrote a proportion for the segment formed by luke segment de. what is ec?

Eliza wants to make $10,000 from her investments. she finds an investment account that earns 4.5% interest. she decides to deposit $2,500 into an account. how much money will be in her account after 14 years?