Answer:
marci got 49/50
Step-by-step explanation:
 
        
                    
             
        
        
        
21 rounded to the nearest 10 is 20 :)
 
        
                    
             
        
        
        
Hey there!! 
A chicken has 1 head and 2 feet . A goat has 1 head and 4 feet 
For heads, total = 40 
Let us take the number of chickens as ' x ' and goats as ' y ' 
x + y = 40 ------------- ( 1 ) 
2x + 4y = 150 ----------- ( 2 ) 
Multiply the first equation with 2 
2x + 2y = 80 
2x + 4y = 150 
Subtract the first equation from the first 
2y = 70 
y = 35 
Number of goats = 35 
substitute this in other equation 
x + y = 40 
x + 35 = 40 
x = 5 
Number of chickens are 4 
Hope it helps!
 
        
             
        
        
        
Answer:
Center: (4,8)
Radius: 2.5
Equation: 
Step-by-step explanation:
It was given that; the endpoints of the longest chord on a circle are (4, 5.5) and (4, 10.5).
Note that the longest chord is the diameter;
The midpoint of the ends of the diameter gives us the center;
Use the midpoint formula;

The center is at; 
To find the radius, use the distance formula to find the distance from the center to one of the endpoints.
The distance formula is;




The equation of the circle in standard form is given by;

We substitute the center and the radius into the formula to get;


 
        
             
        
        
        
Answer:
4.93
Step-by-step explanation: