Answer: 12.20 feet.
Step-by-step explanation:
 Observe in the figure attached that a right triangle is formed.
 Then, you  need to remember the identity:
 
 In this case you can identify that:
 
 
 Then, to find the length of the wooden board (x), you need to substitute values and solve for x. 
 Therefore, you get:
 
 The length of the wooden board is: 12.20 feet.
 
        
             
        
        
        
Answer:
multiply 8 by 5 then round :D
Step-by-step explanation:
 
        
                    
             
        
        
        
You can solve this by dividing the baches into the total amount of donuts. 
147/7=21
Each batch has 21 donuts.