18) A pyramid 5 km tall with a right triangle for a
base with side lengths 3 km, 4 km, and 5 km.

think the answer would beb

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)

7 is the median   7.875 is the mean

step-by-step explanation:

3,4,5,6,8,11,13,13