1:
A has volume 965=270 and surface area 2(96+95+65)=258.
B has volume 9310=270 and surface area 2(910+93+310)=294.
D is the correct answer.
2: The surface area is 2(68+613+813)=460.
3: The area of one of the triangular areas is 524/2=60, the area of one of the upper rectangles is 1316=208, and the area of the lower one is 1624=384.
There are two triangles, two upper rectangles, and one lower rectangle, so we have a total of 602+2082+384=920.
4: The bottom square has area 3030=900, and each upper triangle has area 3045/2=675. We have four triangles and one square, so our answer is 6754+900=3600.
