Asquare with an area of 64 square inches has a perimeter of_?

Simply 8x squared + 5(7x squared- x) - 2x =

Prove that quadrilateral is a rhombus.

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