Well I don't get what the other parts of the question is asking, but they can make 240 packs of pencils.
 
        
             
        
        
        
Answer: x^2(1-4x)
Explanation: factor x^2 out of x^2 - 4x^3
        
             
        
        
        
Answer:
D. 25.3
Step-by-step explanation:
tan∅ = opposite over adjacent
Step 1: Write equation
tan66.5° = x/11
Step 2: Multiply both sides by 11
11tan66.5° = x
Step 3: Evaluate
x = 25.2983
x ≈ 25.3
 
        
                    
             
        
        
        
Simply 
3Y+-21=12X
Re-order the terms
-21+3Y=12X
(Solving for Y variable)
Move all terms containing y to the left, all other terms to the right.
Add 21 to each side of the equation 
-21+21+3Y=21+12X
Combine like terms: -21+21=0
0+3Y=21+12X
3Y=21+12X
Divide each side by 3
Y=7+4X
Simplifying 
Y=7+4x
I hope this helps!! :)