Cual es la propiedad de 5 x 4 = 4 x 5

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

The area of the map is the product of the length and width. write and expression for the area as the product of the two binomials do not multiply

Need same math paper but the back now i hope your able to read it cleary i need with hw