Plz help :( I don’t understand

What is the best reason for jacinta to have a savings account in addition to a checking account

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Rena is building a 1: 180 scale model of a real castle. her model has a rectangular base that is 3 feet wide and 4 feet long what is the area of the base of the actual castle in square feet