To get percent error you take actual-predicted and divide by the actual then multiply by 100 to get the percent.
65-50=15
15/60=0.25
0.25 times 100 =25%
 
        
                    
             
        
        
        
Answer:
I'm in 10th grade so I'll see what I can do and will answer to the best of my ability. 
Step-by-step explanation:
What Julie did wrong was, she did simplify she just did it wrong. She used 4*8 which does equal 32 but 8 can't be simplified anymore than that. If she would of used 2*16 then her answer would be right.
Hope this helps!
 
        
                    
             
        
        
        
Part A: Net A is correct 
Net B is incorrect because de triangular sides do not close the opening left in both sides. 
Part B: AB=3 in., BC=5in., CD=8.6in.
Part C: The surface area of the prism is the area of the the big rectangle in the net + the area of the 2 triangles
Area of the big rectangle
8.6• ( 3+4+5)= 103.2 in ^2
Area of the triangles 
If we get the 2 trangles together along their longest side we get another rectangle 
3•4 =12 in^2
Surface area of prism is 103.2+12=115.2 in^2