Answer:
C
Step-by-step explanation:
According to SohCahToa, cosine is adjacent over the hypotenuse.
The adjacent when looking from angle b, is 21.
The hypotenuse of this triangle is 29.
So Cos B=21/29
 
        
             
        
        
        
28/7 =4 
7•4 is 28 or 
7+7+7+7 is also 28
        
             
        
        
        
See  the attached picture:
 
        
        
        
3*25=75
so the question is 75/8
you would 10 packages since
8*8=64
8*9=72
but 8*10=80 is enough, remainder 5