15 straws are needed
15
18 straws.
I need 100 straws.
2 squares and 4 rectangles * * * * * 6 rectagles in three pairs. The ends need not be squares.
15 straws are needed
15
24
9
6 sides are needed
A larger rectangular prism.
18 straws.
The answer depends on their relative dimensions.
You'll need 18 straws because it has 18 edges
I need 100 straws.
A rectangular prism has 6 flat surfaces
10