Answer:
The inequality for this would be n ≥ 20.
We know this because it must be larger than 40. We also know it can possibly be equal because the statement says "at least".
Step-by-step explanation:
180
Base x Height
So 9 x 20 to get 180
none
there's only ten cubes
3n+3=5.4
3n=2.5
n= 4/5
0.8