A solid estimate would be 790,000,000
        
             
        
        
        
<h3>Answer:  Step-by-step explanation:
You have to make an addition with the individual times: 56.25+59.89+58.55+55.4=230.17 seconds. Now you should to convert it into a minutes and seconds.  1 minute= 60 seconds
2 minute= 120 seconds
3minute= 180 seconds
4minute= 240 seconds
In this way you they have 3 minutes and the remainder is 50 seconds.  
So, the time for the team is 3 minutes and 50.17 seconds.</h3>
        
                    
             
        
        
        


Take HJ = a, GH = b and GJ = c
put the value of a from equation 1 in equation 2
now, put the value of a and c in equation 3
Now, we need to find HJ (a)

 
        
             
        
        
        
Given:
Total number of coins (Quarters and dimes) = 60
Total amount = $12.45
To find:
The number of quarters and dimes. 
Solution:
Let x be the number of quarters and y be the number of dimes.
We know that,
1 quarter = 0.25 dollar
1 dime = 0.10 dollar
Total coins:  ...(i)
               ...(i)
Total amount:  ...(ii)
             ...(ii)
From (i), we get
 ...(iii)
          ...(iii)
Putting this value in (ii), we get




Divide both sides by 0.15.


Putting x=43 in (iii), we get


So, the number of quarters is 43 and the number of dimes is 17.
Therefore, the correct option is b.
 
        
             
        
        
        
(8x + 7) - (2x - 3)
(8x + 7) + (-2x + 3)
combine like terms
8x - 2x and 7 + 3
6x + 10