just like the previous one, we sum the sides to get the perimeter.

 
        
             
        
        
        
If you are rounding it will be the same thing
        
             
        
        
        
Answer:
they both has 7 slides and the presentation had a duration of 28 seconds
Step-by-step explanation:
we have to setup equation that makes them equal to each other if you know what i mean. 2x+16=3x+10 
then we just solve for x
2x+16=3x+10
subtract 10 from each side 
2x+6=3x
step 2 subtract 2x from each side 
x=6
so both of their presentations are 7 slides long 
then to find the length of their presentations we just plug in 6 to one of the equations
2(6)+16 
2x6=12 12+16=28 so both of their presentations were 28 seconds
 
        
             
        
        
        
The answer is 42,8,6 that it the right answer