Which explanation correctly analyzes the difference between an irrational number and a rational number?

Abbey purchased a house using a fixed rate mortgage. the annual interest rate is 4.2% compounded monthly for 20 years. the mortgage amount is $235,000. what is the monthly payment on the mortgage? this isn't a multiple choice question have to show my work

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?