Me asap ill mark brainliest but plz be correct !

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?

Ze trinomial x2 + bx – c has factors of (x + m)(x – n), where m, n, and b are positive. what is ze relationship between the values of m and n? explain how you got ze answer