Answer:
in English please I am quite puzzled 
 
        
             
        
        
        
consider east-west direction along X-axis  and north-south direction along Y-axis
 = velocity of migrating robin relative to air = 12 j m/s
 = velocity of migrating robin relative to air = 12 j m/s 
(where "j" is unit vector in Y-direction)
 = velocity of air relative to ground = 6.3 i m/s
 = velocity of air relative to ground = 6.3 i m/s 
(where "i" is unit vector in X-direction)
 = velocity of migrating robin relative to ground = ?
 = velocity of migrating robin relative to ground = ?
using the equation 
 =
 =  +
 + 
 = 12 j + 6.3 i
 = 12 j + 6.3 i
 = 6.3 i + 12 j
 = 6.3 i + 12 j
magnitude : sqrt((6.3)² + (12)²) = 13.6 m/s 
direction : tan⁻¹(12/6.3) = 62.3 deg north of east
 
        
             
        
        
        
228 - 224 = 4
there is 4g of solute in the solution.
        
             
        
        
        
<span>Each color has a different wavelength allowing the eye to see it.</span>
        
             
        
        
        
Answer:
1. Battery
2. Copper wire
3. Nail or piece of metal (zinc, iron, or steel).