First, let's convert the mixed number 1 1/2 to the improper fraction 3/2. We're given that it takes 3/2 days to install 3/5 of a fence. We're looking for how long it takes to install one whole fence - or 5/5 of a fence. To determine that, let's first find out how long it takes to install <em>1/5 of a fence</em>, and then multiply that quantity by 5 to obtain our answer.
If it takes 3/2 days (3 half-days) to install 3/5 of a fence (3 fifths of a fence), then it makes sense that it would take <em>1/2 </em><em>day</em> (<em>1 </em>half-day) to install <em>1/5</em> of a fence (<em>1 </em>fifth of a fence).
If it takes 1/2 day to install 1/5 of a fence, then it should take 5 times that amount of time to install all 5/5 of it, or 5 * (1/2) = 5/2 days, or 2 1/2 days as a mixed number.
No it's not the same.
First of all, miles is used for length while mi2 is used for Area.
Second, if the length of each side is 10 miles , the total area would be 10 x 10 = 100 mi2
hope this helps
The red area is the one which solves the system. In fact, we want the area which below both the parabola and the line (since the inequality features a 
sign.
So, the point 
is below the line but above the parabola (blue area), so it is not a solution.
The point 
is above both the line and the parabola (white area), so it is not a solution.
The point 
is below both the line and the parabola (red area), so it is a solution.
So, the point 
is below the parabola but above the line (green area), so it is not a solution.
