Step-by-step explanation:

Answer:
160 dollars
Step-by-step explanation:
So you would add 6.19 and 9.81 together. Then divide it by 2. You would get 8. Then multiply it by 20 and you would get 160 dollars
The area of a hexagon is
A= a^2 (3√3)/2
we replace a with 4
A=41.57
The way this should be set up is:
9a = 3600...
So you must divide '9' on both sides, canceling out the '9', and making the 3600 to be '400'..
So the problem should look like: a = 400 <--- (Answer)
Hope it helped.. :)
<span />