Is 3/5 less, greater, or equal to 7/10

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

How to do this , and can some one explain

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.