The equation R=-0.0028t+20.8 can be used to predict the world record in the 200-m dash, where R is the record in seconds and t i
s the number of years since 1920. In what year will the record be 18.0 seconds?
       
      
                
     
    
    
    
    
    1 answer:
            
              
              
                
                
Answer:
The world record for the 200-m dash will be set at 18.0 seconds in the year 2920.
Step-by-step explanation:
To find what year the record will be 18 seconds, substitute 18 in for R, and solve for t.
-0.0028t + 20.8 = R
-0.0028t + 20.8 = 18
-0.0028t = -2.8
t = 1000
The record for the 200-m dash will be 18 seconds after 1000 years. To find which year this record will be set in, add 1000 to the original date, 1920.
1920 + 1000 = 2920
 
                                
             
         	    You might be interested in
    
        
        
Answer:
40
plss mark me brainliesttt
Step-by-step explanation:
4÷1/2=8
5×8=40
 
        
             
        
        
        
The integer that describes making a $10 deposit is: Positive 10: +10
        
             
        
        
        
Answer:
r=41/2
Step-by-step explanation:
You have to divide the diameter,  41, by 2 because the radius of the circle is half of the diameter. So, the answer would be 20.5 
 
        
                    
             
        
        
        
With a dice right is it math I’m confused
        
                    
             
        
        
        
Twenty-five times two = fifty