Answer:
Step-by-step explanation:
Slope= -3/1
plot from point  (-2,4)
 
        
                    
             
        
        
        
Answer:
a kite
Step-by-step explanation:
because the question asks what special quadrennial is formed  by connecting the midpoints 
 
        
             
        
        
        
Answer:

Step-by-step explanation:
Given



Required
Determine the coordinates of the centroid
Represent the coordinates with C.
C is calculated as follows:

Substitute values of x and y in the given equation



<em>The above is the coordinate of the centroid</em>
 
        
             
        
        
        
Answer:
First brand of antifreeze: 21 gallons
Second brand of antifreeze: 9 gallons
Step-by-step explanation:
Let's call A the amount of  first brand of antifreeze. 20% pure antifreeze
Let's call B the amount of second brand of antifreeze. 70% pure antifreeze
The resulting mixture should have 35% pure antifreeze, and 30 gallons.
Then we know that the total amount of mixture will be:

Then the total amount of pure antifreeze in the mixture will be:


Then we have two equations and two unknowns so we solve the system of equations. Multiply the first equation by -0.7 and add it to the second equation:



                +

--------------------------------------



We substitute the value of A into one of the two equations and solve for B.


 
        
             
        
        
        
We just need to get the perimeter of the backyard.
Whole rectangle: length = 7ft ; width = 5 ft
Perimeter = 2(7+5) = 2(12) = 24 ft