Enter each answer as a whole number. pls help asap

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

Which best explains why this triangle is or is not a right triangle ?

Polygon abcd is a rectangle what is the area