B, D, E. Rectangle and polygon are 2 dimensional and its obviously not a pyramid.
I would be happy to help with this question!
you would need to use the pythagorean theorem inputting 3.5 for a and 15 for c. after this you will need to solve for b and you should get the answer of 14.6feet
This is the answer. I did it and got that. You do distributive and then combine like terms.