exam Maths Puzzle Numerical Ability

i dont know how to do these problems. my teacher says that we need to open the figure up but i dont get it

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exam Other Question

A lifesaver has a 3cm diameter, a 1 cm hole and has 1/2 cm height. Find the volume and the total surface area of the lifesaver.

b). One hundred 1-inch cubes are glued togethe What is the slope of the line with the equation 2x+3y+6=0??
A. (-6,1) B. (-4,-1) C. (-4,3) D. (-2,1) E. (8,1)