If you're asking the difference between 14 ft and 21 ft your answer is 7 ft, just subtract 14 from 21
B. I am so sorry if it is not right
Use TrianCal to draw a triangle with phi as Great Piramid (minimum perimeter given 2 equal heights) = maximun stability.
NOTE: Phi=(1+√5)/2≈1.62 and acos(1/Phi)≈51.83º
The population would grow 1309 people (total 39,809)
Answer:
I think it's the last one. Sorry if I'm wrong