Answer:
A
Step-by-step explanation:
 
        
             
        
        
        
The original air present after 8 breaths will be equal to 179.81 ml.
<h3>What is an equation?</h3>
 
The equation in mathematics is the relationship between the variables and the number and establishes the relationship between the two or more variables.
It is given in the question that:- 
During normal breathing, about 12% of the air in the lungs is replaced after one breath
If the initial amount of air in the lungs is 500 mL 
how much of the original air is present after 8 breaths?
The calculation for the eduction of the air will be done by the following equation:-

=179.88 ml
Hence original air present after 8 breaths will be equal to 179.81 ml.
To know more about equations follow
brainly.com/question/2972832
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Hey! 
First, you would take 349 and subtract 25 from it.(349-25=324) This gets rid of the down payment. 
Next, you would divide 324 by 54. (324÷54=6)
It would take him 6 weeks! 
Hope this helped! And make sure to check my calculations! 
Godspeed
-Song
        
             
        
        
        
Answer: 16517 dollars
Step-by-step explanation:
Given that x is the number of years after 2000.
In 2005, the number of years x = 4
Because the equation was modelled for 4 year college courses 
The best estimate for the average cost of tuition in 2005 will be 
ŷ = 937.98(4) + 12,764.90 
Y = 3751.92 + 12764.9
Y = 16516.82 dollars 
Y = 16517 dollars