Answer:

Step-by-step explanation:
Given the exponential decay function 
When
then

so the initial amount is 
The exponential decay function
has the decay factor 
In your case, the eexponential decay factor is 
The answers to the first two systems of equations
Answer:
Step-by-step explanation:
4x-17+3x+8+x+13=180
8x+4 =180
8x=176
X=22
The distance around the bulletin board would be 20 feet, because you multiply 6ft 2x and 4ft 2x.
I'm pretty sure the answer is 1 1/16