Since we know that a - 2 will equal 8, it is safe to assume that 8 + 2 = 10. Therefore a=10.
The answer is letter d. The Fibonacci Sequence states to add the 2 previous number to get the next number starting with 1. So, 1 + 0=1, 1+1=2, 1+2=3, 2+3=5,3+5=8, 5+8=13, etc....
I added 13+21 to get 34. Then add 21+34 to get 55. Then add 34+55 to get 89.
The volume of the cuboid is 900 in meters.
