5b-2=13  add 2 to both sides
5b=15  divide both sides by 5
b=3
        
                    
             
        
        
        
Answer:
-8m + (-7.7n - 6)
Step-by-step explanation:
You distribute the negative in front of the parentheses, to everything inside of the parentheses, and change the sign to addition. 
 
        
             
        
        
        
It is the bottom right corner choice
        
                    
             
        
        
        
The stake the rope is tied to is the center of the circle. If the goat pulls the rope as far as it can go and walks around like this he makes a circle and he can eat the grass anywhere within this circle.
(a) Since the area of a circle is given by 

 this is the formula we can use to find the area of the yard where the goat can roam/eat/reach.
(b) Since the rope is 4 feet the radius r = 4 and the area is given by 

 square feet. That's the exact area. For an approximation you could substitute 3.14 for pi and get 50.24 square feet.
(c)Since the rope is 5 feet the radius r = 4 and the area is given by 

 square feet. That's the exact area.
For an approximation you could substitute 3.14 for pi and get 78.5
square feet.