Carol has 50 dollars and spends 10 how much is left

The triangles are similar. what is the value of x? x=

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

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