Since you're given the base for the perimeter of the rectangle, you can solve this question quickly.
First, you multiply 21 by 2, because there are two bases to a rectangle.
You'll get 42, and you will have to do 60-42 to find the perimeter for the remaining two sides.
60-42 will give you 18, so you can divide that by 2 because there are two other sides, giving you 9.
Now you have the side lengths 21 and 9. Area is base*height, so you can multiply 21*9 and get 189.
Therefore, the area of the rectangle is 189 meters
 
        
             
        
        
        
Answer:
Not sure
Step-by-step explanation:
Sorry
 
        
                    
             
        
        
        
Answer:
The American population was 20% of the British population.
Step-by-step explanation:
Let us call  the american population,
 the american population,  the British population before the migration, and
 the British population before the migration, and  the population that migrated from America to Britannia.
 the population that migrated from America to Britannia. 
Now, the population  that migrated was 20% of the american population:
 that migrated was 20% of the american population: 
 ,
,
and the same population  increase the British population by 4%:
 increase the British population by 4%: 

Combining equation (1) and (2) we get: 



Thus, the American population was 20% of the British population.
 
        
             
        
        
        
Answer:
   30
Step-by-step explanation:
The midpoint of BC will be a distance from line k that is the average of the distances of B and C: (17+13)/2 = 15. Call that midpoint P. We know distance MP is half of distance MA. This same relationship will hold with respect to the distances from P and A to any line through M. That is, the distance from line k (through M) is twice the distance from P to line k: 30 units.