The answer is:  "39 points" .
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Explanation:
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" x/ 50 = 78/100 " ;   in which "x" equals the number of points needed.
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To solve for "x" ; 
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Look at the denominators:  50 * (what value?) = 100.
→ "100 ÷ 50 = 2" .
→ So;  "50 * 2 = 100" ; 
So, let us look at the numerators:
x * 2 = 78 ; 
↔  2x = 72 ; 
Divide each side of the equation by "2" ; to isolate "x" on one side of the equation ; and to solve for "x" ;
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 →  78 ÷ 2 = 39 ;
The answer is:  "39 points" .
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Answer:
Total cost for 2.80 hours = ($255/hr)(2.80 hrs) = $714.
Step-by-step explanation:
Multiply this hourly rate by the elapsed time (2.80 hours):
Total cost for 2.80 hours = ($255/hr)(2.80 hrs) = $714.
 
        
             
        
        
        
Answer:
9/10 > 78/100
Step-by-step explanation:
We can make 9/10 into 90/100, and since they now have the same denominator (Bottom number in fraction), we can now compare the numerators (Top number in fraction). 90 is greater than 78 so we can say that 9/10 > 78/100 (9/10 is greater than 78/100).
 
        
             
        
        
        
He can complete 35 questions in 1.75 minutes
1/20=x/35
Simplify both sides
x=1.75
        
                    
             
        
        
        
Answer:
Solo se puede usarlas con triángulos rectángulos (right triangles en ingles).