Answer: 
Step-by-step explanation:
Given
Rectangle has an area of 
Suppose rectangle length and width are
and 
If each side is increased by 
Area becomes 
We can write

Substitute the value of width from (ii) in equation (i)

Width corresponding to these lengths

Therfore, we can write the length of the longer side is 
Answer: See the pictures
Step-by-step explanation:
Hope I helped!
Sorry it took so long btw
Answer:x=7
Step-by-step explanation: Set up 3x-1 equal to 20
Then do your usual distributing.