The patch doubles in size each day so, on the 47th will be half the size than on the 48th day
        
             
        
        
        
Answer:
The length of the rectangular field is 12 ft and the width is 5 ft. 
Step-by-step explanation:
The area of a rectangle is:

The area of a rectangular field is, <em>A</em> = 60 ft.
The length of the field is:
l = w + 7
Compute the width of the field as follows:


Factorize the last equation by splitting the middle term as follows:

Now, since the width of rectangular field cannot be negative, the width is 5 ft.
Compute the length as follows:
l = w + 7
  = 5 + 7 
  = 12
The length of the rectangular field is 12 ft. 
 
        
             
        
        
        
I believe your answer is going to be increasing linear. If it's doubling constantly then it's increasing so that takes out 2 options. And since it's constant, it isn't exponential, therefore you only have increasing linear left.
I hope I was able to help. Best of luck.
        
             
        
        
        
82 = 4x-10
72 = 4x
x = 72/4
x = 18
she owned it for 18 days