What is -81=26+n? Please answer if you know

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 midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Solve for x and select the correct answer