Determine the perimeter of a square with a diagonal of square root 72 centimeters

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

20.ju inces. which ordered pair is a viable solution if x represents the number of books he orders and y represents the total weight of the books, in ounces? (-3,-18) (-0.5, -3) (0,0) (0.5, 3)