3x+2x-13=47
5x-13=47
5x=60
x=12
18/3=6 you do this because you assume all the cubes are the same. Also because they form a cube they are proportionate to each other.
8,300,000 is your answer because 8 is higher then five so you add one to 9 which make it ten so u have to add one more to 200,000
Step-by-step explanation:
1). 1
2). 36
3). 16
sorry I can't explain it properly, all you have to do is to dive the coefficient of x by 2 and square the result