Answer:
21
Step-by-step explanation:
(9x2 + 6x – 7) + (-9x - 5) = 21
 
        
                    
             
        
        
        
When applying indirect proofs, we assume the negation of the conclusion is true, and show that this assumption would lead to nonsense, or contradiction.
In our case we assume a is not smaller than 7, that is we assume a≥7.
a≥7 then, multiplying both sides by 3:
3a≥21, then, adding both sides 7:
3a+7≥28, 
which is a contradiction because 3a+7 is smaller than 28.
So our assumption is wrong, which means the opposite of it is correct.
Answer: assume a≥7
        
             
        
        
        
Answer:
1,262.5
according to the calculator lol
 
        
                    
             
        
        
        
Answer:
8
Step-by-step explanation:
Total length of the fabric is 
We need to find the number of scarves can she make if she needs 5/6 of a yard for each scarf.
Let she needs x scarves. So, ATQ

Hence, she can make 8 scarves.