B. Banks want to know if it's risky or not to loan you money
        
                    
             
        
        
        
Answer:
781250  
 
Step-by-step explanation:
Let y is the length of the farm field
Let x is the width of the farm field 
Given that, no fencing is necessary along the rock wall, so we can find the perimeter of the farm is: 
2x + y = 2500 feet 
<=> y = 2500 -2x 
The are of the farm has the following formula: 
A = x*y 
<=> A = x(2500 - 2x) 
<=> A = 2500x -2 
 
To have  the maximum area of field in square feet, we need to use differentials to estimate:
 = 2500 - 4x
 = 2500 - 4x 
Set  = 0, we have:
 = 0, we have: 
2500 - 4x  = 0
<=> x = 625 feet. 
=> y = 2500 - 2*625 = 1250 feet 
So the maximum area of field is: 
A = x*y = 625*1250 = 781250  
 
 
        
             
        
        
        
Answer:
-50x - 66
Step-by-step explanation:
 
        
                    
             
        
        
        
All you have to do is plug in 15 to f(x) to get
15=4|x-5|+3 then solve for x
12=4|x-5|
3=|x-5|
3=x-5
-3=x-5
x=8, -2
Hope this helped :)