Hello, 
               Yes of course 0.4 or 4/10 is a rational number :)
 
                                                                          Have a nice day :)
        
                    
             
        
        
        
Answer:
positive
Step-by-step explanation:
the discriminant of the function is postive.
 because from the graph we notice that it has 2 intercepts on x-axis, which means the function has 2 real solution when y=0
that implies the discriminant is positive.

if  we have 2 distinct real solution
 we have 2 distinct real solution
if  we have no real solution but 2 complex solutions
 we have no real solution but 2 complex solutions
if  we have 2 identical real solution
 we have 2 identical real solution
 
        
             
        
        
        
<span>Best Answer: 1) Q is positive therefore the process is endothermic. .769kj+-.810kj=-.041kj
2) Heat is released meaning it is exothermic. -66.9kj+45=-21.9kj
3) 7.29kj. Endothermic.</span>
        
             
        
        
        
Answer:
18
Step-by-step explanation:
 
        
             
        
        
        
It's 13000, just think about it....