Asports writer makes his pre-season picks for the top ten team finish. if there are 40 teams, how many different lists could there be?

Cora bought a package of erasers. there are 4 pink erasers and 12 blue erasers. what is the ratio of pink erasers to blue erasers?

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a

Having a hard time understanding this question (see attachment).