Answer:
negative 21/9 times negative 18/7  is 6
Step-by-step explanation:
The phrase negative 21/9 times negative 18/7 can be written mathematically as 

Lets first convert the fractions into decimal values
 = -2.33
 = -2.33
 =  -2.57
 =  -2.57
Now on simplyfying
=>
=> 5.988
=>6 (rounding off)
We will get a positive value because the multiplicative law states that the product of two negative number is positive
 
        
             
        
        
        
Answer: Length = 42ft Width = 21ft
Step-by-step explanation:
Let "w" be width
W = 21ft
w x 2 = L
L = 42ft
Perimeter:
42+42+21+21
=126
 
        
             
        
        
        
nononononon nonononononno
Step-by-step explanation:
nonononononomonjknonkkom
 
        
             
        
        
        
80y² - 5x²
Factorise
5(16y²-x²)
hope this helps
divide out any similar things, in this case, it is 5
put it outside the parenthesis, and leave the leftover inside the parenthesis
hope this helps