Two cheaper books = x
more expensive = 1.5x
so, 2.5x=150 
150/2.5=x=60
therefore the more expensive book = 90
        
             
        
        
        
Answer:
I<em>t D</em>e<em>p</em>en<em>d</em>s
Step-by-step explanation:
 
        
                    
             
        
        
        
16: -7(5)= -35 ( REMEMBER THE MOUTH EATS THE BIGGEST NUMBER!)
     -6(-6)= 36   therefore 36 is greater than -35
18: they are exactly the same because in multiplication with inters it matters when the signs change. so 3(-6) = -18 ad -3(6)= -18 then -18=-18
20: Same as 18 where division has the same rules. if 8x5=40 then 40/8=5
-40/8=-5 and 40/(-8)=-5 then -5=-5
answers: 
        
                    
             
        
        
        
maybe 28 is the answer...
 
        
                    
             
        
        
        
<span>12+3(8+x)
= 12 + 24 + 3x
= 3x + 36</span>