Answer:
this is easy lol firs add 3+9 which will be 12 then 8+1 so its 9/12 and for the second one 12 +9 21 then 8+4 12/21
#2
The shape can be cut into four rectangles and two squares.
Total surface area:
⇒ four rectangles + two squares
⇒ 4(Length × Width) + 2(side × side)
⇒ 4(6 × 1.5) + 2(1.5 × 1.5)
⇒ 36 + 4.5
⇒ 40.5 inch²
Therefore, the surface area of the rectangular prism is 40.5 inch²
#3
The polygons that would be used in this net surface area are:
✔ rectangle
✔ square
Pretty good so far its hard also.