Hey there!
The answer to your question is 
Given:

First, we distribute the negative sign to both terms (
) This would make the
negative and the
positive, so we have:

Add them together and we get:

Have a nice day!
It is a prime number. 89=1×89 hope it helps
207000 for 1800ft
? for 1ft
Step 1:
Cross multiply
1×207000=207000
Step 2:
207000÷1800=115
As a result, the answer will be 115 per foot. Hope it help!