Answer:
add up c
Step-by-step explanation:
 
        
             
        
        
        
Answer:
   6 minutes
Step-by-step explanation:
'a' in the formula represents altitude in feet. You are told the altitude is 21000 feet, so put that into the formula:
    21000 = 3400t +600
You can solve this for t:
   20400 = 3400t . . . . . subtract 600 from both sides
   6 = t . . . . . . . . . . . . . . . divide both sides by 3400
The problem statement tells you that t represents minutes after lift off, so this solution means the altitude is 21000 feet 6 minutes after lift off.
The question is asking for the number of minutes after lift off that the plane reaches an altitude of 21000 feet, so this answers the question directly:
   The plane is at an altitude of 21000 feet 6 minutes after lift off.
 
        
             
        
        
        
Answer:
36 : 6 and -6
 12 = 
1.96 =1.4 and -1.4
 0.64 : 0.8 and -0.8
400 : 20 and -20
 25/36 = 5/6 and -5/6
Step-by-step explanation:
we know that 
(-x)^2 = x^2 
ALSO 
(x)^2 = x^2 
thus, square of both negative and positive number is same positive number.
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36 = 6*6
36 = -6*-6
hence 
square roots of 36 is both -6 and 6
12 = 4*3 =  
 

also 
12 = 

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1.96 = 196/100 = (14/10)^2
1.96 = 196/100 = (-14/10)^2
hence 

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0.64 = 64/100 = (8/10)^2 = 0.8^2
0.64 = 64/100 = (-8/10)^2 = (-0.8)^2
Thus, square root of  0.64 = 0.8 and -0.8
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400 = 20^2
400 = (-20)^2

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25/36 = (5/6)^2 
25/36 = (-5/6)^2 

 
        
             
        
        
        
Answer:$120
Step-by-step explanation
I had homework over this a day ago