Answer:
7
Step-by-step explanation:
Its 7 im sorry if im wrong 
 
        
                    
             
        
        
        
Answer:
<u><em>6</em></u> rolls because the total perimeter is 102 ft and five rolls is only 100 feet. So she needs <em><u>6</u></em> rolls. 
Step-by-step explanation:
to find perimeter, add up all the side lengths. 
so 15*4 (it's easier than 15+15+15...) 
60 ft. 
now we have to use Pythagorean's Theorum to find corner to corner. 
so  
 
we have a and b 
 
 
do the math... 
225+225= 450 
square root of 450= 
21.213 
double that because it's used twice (corner to corner and corner to corner) 
42.426 
now add it all up 
42.426 + 60 = 102.426 
we can round 
102
20*5 = 100
so she needs 6 
MY ORIGINAL ERROR WAS 5, BUT 5 TIMES 20 IS ONLY 80, SO THEREFORE 6 IS REQUIRED SO THERE IS ENOUGH TO COVER 102. 
 
        
             
        
        
        
No.  26,341 is not evenly divisible by 3 .
Here's the trick you can use to decide this 
just by looking at a big number:
==>               If a number is divisible by 3, then the
                     sum of its digits is divisible by 3. 
I've never taken the trouble to figure out why this works,
but it does work.  I didn't make it up.  It's widely known.
So let's look at  26,341 .
The sum of the digits is  (2 + 6 + 3 + 4 + 1)  =  16 .
16  is not divisible by  3 , so  26,341  is not divisible by  3 . 
Is that cool or what !
        
                    
             
        
        
        
The answer would be 105, it's square root is approximately 10.2469 <span />