What is the area of this trapezoid

A rectangle with a length of 10 and a height of 9 has two right triangles on each side of it with short leg lengths of 9.

Simplify 4 square root of 2 end root plus 7 square root of 2 end root minus 3 square root of 2 . (1 point) 2 square root of 8 8 square root of 2 8 square root of 6 6 square root of 8

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?

9is the geometric mean between x and 12