Answer:
When the solution is negative
Step-by-step explanation:
One example, let's say you are buying pens and each pen cost 3 dollars and you cannot spend more than 15 dollars, how many pens can you buy? 
The inequality would be 3x < 15, so any negative solution is not reasonable because you cannot buy negative pens. The same goes for most real-world problems dealing with time, money, or distance.  
 
        
             
        
        
        
 
3,301927249 = ³√36
 
As discussed in one of my videos on my channel [USERNAME: MATHEMATICS WIZARD] on the Six Rational Exponential Rules, this one states that with a numerator of 1 in the exponent, you take the multiplicative inverse [reciprocal] of the fraction, and set the whole number equal to the root, bringing your a inside the radical, which is 36.
ⁿ√aᵐ = aᵐ\ⁿ → works for both: numerator ≥ 1 
I am joyous to assist you anytime.
 
        
             
        
        
        
Multiply or divide normally. Whenever the signs are different it’s always gonna be a negative.
        
             
        
        
        
The relationship is not proportional because the boys and girls are in different grades and they are in different activities.
        
             
        
        
        
The number of permutations of the 4 different letters, taken two at a time, is given by:
