No 2/3 and 5/6 are not equivalent ratios
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If it is asking if that equation is the quadratic formula, then the answer is false. The reason why is that the first 'b' should be negative
The quadratic formula is

 
        
             
        
        
        
Answer:
Step-by-step explanation: A multiple is many, so if you were assigned to a 
group project you would have multiple people in your group like more than 5 , 7 etc. 
Or in math term if you're dividing a number by another number without a remainder   
 
        
             
        
        
        
5 minutes         x minutes
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4 dishes           24 dishes
using cross products
5 * 24 = 4 * x
divide each side by 4
5*24/4 = x
30=x
It will take 30 minutes