Answer:
The value is  
Step-by-step explanation:
From the question we are told that 
     The length of the treads is  
      The length of the risers is  
Generally the slope of the staircase is 
          
=>       
=>       
 
        
             
        
        
        
Answer:do u want to know whether its positive?
Step-by-step explanation:if it is it ,the answer as to my knowledge is yes
 
        
             
        
        
        
Answer:
the mode remains the same
Step-by-step explanation:
42 is outlier.
mod is the most repetitive number of a number string, and outlier does not change it.
the mode remains the same.
 
        
             
        
        
        
There is no solution ,<span>a+c=-10;b-c=15;a-2b+c=-5 </span>No solution System of Linear Equations entered : [1] 2a+c=-10
[2] b-c=15
[3] a-2b+c=-5
Equations Simplified or Rearranged :<span><span>  [1] 2a + c = -10
</span><span>  [2] - c + b = 15
</span><span>  [3] a + c - 2b = -5
</span></span>Solve by Substitution :
// Solve equation [3] for the variable  c  
 
<span> [3] c = -a + 2b - 5
</span>
// Plug this in for variable  c  in equation [1]
<span><span>  [1] 2a + (-a +2?-5) = -10
</span><span>  [1] a = -5
</span></span>
// Plug this in for variable  c  in equation [2]
<span><span>  [2] - (-? +2b-5) + b = 15
</span><span>  [2] - b = 10
</span></span>
// Solve equation [2] for the variable  ?  
 
<span> [2] ? = b + 10
</span>
// Plug this in for variable  ?  in equation [1]
<span><span>  [1] (? +10) = -5
</span><span>  [1] 0 = -15 => NO solution
</span></span><span>No solution</span>