Answer:
u should put his is English and then translate it to read it
8*.8=6.4
4x+6.4=40
40-6.4=33.6
33.6/4=x
8.4=x
Hope this helps :)
Its d 729 because on 1 layer theres are 81 cubes and there are 9 layers so 81 times 9 equals 729
Hope this helps
The answer a are
1 C
2 A
3 whatever letter has the the answer 5x10^10