Photo is above. Show work thank you. Questions at bottom.

Mary wants to make a box. She starts with a piece of cardboard whose length is 15 centimeters and width is 10 centimeters. Then she cuts 4 congruent squares with sides of 3 centimeters at the four corners and folded at the broken lines to make a box.

1) what is the surface area of the box?

2) What is the volume of the box?

3) Explain how you determined the surface area and volume.