Explanation 
Sorry but You gone have to higher the price for this, this is a big question.
        
             
        
        
        
Answer:
   -4x^3 +12x^2 for 0 < x < 3
Step-by-step explanation:
The power rule is appropriate:
   (d/dx)x^n = n·x^(n-1)
This is applied to each of the terms.
   F'(x) = -(4·x^3) +4(3x^2) +0
   F'(x) = -4x^3 +12x^2 . . . . for 0 < x < 3
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The derivative is not defined at the endpoints of the interval, so F'(x) is only defined on (0, 3), not [0, 3].
 
        
             
        
        
        
Answer:
9y
Step-by-step explanation:
Add 7y and 5y which equals 12y. Then subtract 3y from 12y and u get 9y. It might be wrong
 
        
                    
             
        
        
        
3/5x + 1/2y = 30
-3/5x. -3/5x
1/2y = -3/5x + 30 
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 1/2
Y= -1.2x + 60
        
             
        
        
        
Answer:
A.
Step-by-step explanation:
d = rt
If t is the time taken by the train, then the truck takes t+2 hours.
For the truck:
d = 45(t + 2)
For the train:
d =  60t
Total distance travelled by both:
= 2d
= 60t + 45(t + 2)
= 60t + 45t + 90
= 105t + 90      where t is the time taken by the train.