find the surface area of a textbook that is 2 in * 14 in * 9 in
The surface area of the textbook can be found by adding up the areas of all its faces.
The textbook has 6 faces: 2 faces with dimensions 2 in * 14 in (top and bottom faces), 2 faces with dimensions 2 in * 9 in (side faces), and 2 faces with dimensions 14 in * 9 in (front and back faces).
The area of the top and bottom faces is 2 in * 14 in = 28 in² each.
The area of the side faces is 2 in * 9 in = 18 in² each.
The area of the front and back faces is 14 in * 9 in = 126 in² each.
Adding up all the areas:
Surface Area = (28 in²) + (28 in²) + (18 in²) + (18 in²) + (126 in²) + (126 in²) = 344 in².
Therefore, the surface area of the textbook is 344 square inches.