dy/dx = 8(8x - 5)(4x² - 5x )^ 7
differentiate using the ' chain rule '
dy/dx = 8(4x² - 5x)^ 7 × d/dx (4x² - 5x) 
          = 8(4x² - 5x)^ 7  × (8x - 5)
          = 8(8x - 5)(4x² - 5x)
 
        
                    
             
        
        
        
20 Answer: a₁ = 4
<u>Step-by-step explanation:</u>

21 Answer: n = 13
<u>Step-by-step explanation:</u>

22 Answer: n = 5
<u>Step-by-step explanation:</u>

 
        
                    
             
        
        
        
Sorry it says plus but its times
 
        
        
        
Answer:
D) 1/5 e 1/3
Step-by-step explanation:
You have the following quadratic equation:
 (1)
           (1)
In order to find the values of x that are solution to the equation (1), you first find the solution for k in the following equation:

Next, you replace the previous value of k in the equation (1) and you use the quadratic formula to find the roots:

Then, the roots of the equation (1) are
D) 1/5 e 1/3
 
        
             
        
        
        
Answer:
he would need about 16 weeks