What are good ways to study for a math test?

Which fraction below is equivalent to 10/12?

What properties allow transformation to be used as a problem solving tool

Jada has a meal in a restaurant she adds up the prices listed on the menu for everything they ordered and gets a subtotal of $42.00. when the check comes, it says they also need to pay $3.99 in sales tax. what percentage of the subtotal is the sales tax