Can some answer pls.

You are a clerk at convenience store. a customer owes 11.69 for a bag of potatoes chips. she gives you a five dollar bill. how much change should the customer receive?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Determine which postulate or theorem can be used to prove that lmn =nmo