BC = √[(8-1)^2 +(1-6)^2]
BC = √(49+25
BC = √74
BC = 8.6
answer
8.6 units
H is equal to 3. need the solution?
This problem is related to the concept composite function
Suppose that a>b>1, then
and 
Therefore, since 2<3<7, 
Choose an arbitrary x>1. You have that a takes the greatest values at x, c takes the smallest value at x. Thus,
a>b>c and
Answer: correct option is B.
Exponential decay is the answer