If six inscribed, wooden disks are cut from a 36 centimeter by 24 centimeter rectangular block of wood, how many square centimeters of wood will not be used?

Depends how you arrange them
hmm, it is 12x2 by 12x3
so that means each is 12 in diameter

the area of each=pir^2
d/2=r=12/2=6
area of each circle=pi6^2=36pi
there are 6 disks so 216pi is the area of the disks

the amount not used=rectangle-disks=36 times 24-216pi=864-216pi=185.41598682460466049206902921163
so about 185 square cm was not used
if you used 3.14 for pi, then about 186  square cm was not used

5would be the answer- explanation