Base x height
length x width 
hope this helps XD
        
                    
             
        
        
        
Answer:
20 miles per hour
Step-by-step explanation:
traveling against the wind was 160mph (400/2.5)
traveling with the wind was 200mph (400/2)
going against the wind is going in the negative direction of the wind speed, and going with the wind is going in a positive direction of the wind speed, therefore the wind speed is |direction1-direction2|/2, which would be |200-160|/2 = |40|/2 = 20mph
(180mph is neutral speed with no wind, with wind affecting this neutral speed ±20mph)
 
        
             
        
        
        
The correct answer is 215
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
The perimeter, <em>P</em>, is given by

Since  ,
,

Differentiating <em>P</em> with respect to <em>w</em>,

But

