Answer:
Step-by-step explanation:
14x + 7y is the correct answer 
 
        
                    
             
        
        
        
Answer:139 cm squared
Step-by-step explanation:
First separate it:
10x3
7x7
4x15
These are the 3 rectangles that make up this shape
Then multiply
10x3=30
7x7=49
4x15=60
Then add your answers
30+49+60=139cm squared
 
        
             
        
        
        
Answer:
$300
Step-by-step explanation:
1500 • 20% 
1500 • 20/100
15 • 20
300
Hope this helps, good luck! :)
 
        
                    
             
        
        
        
Answer:
20
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
In rectangle ABCD, AB = 6, BC = 8, and DE = DF. 
ΔDEF is one-fourth the area of rectangle ABCD. 
We want to determine the length of EF. 
First, we can find the area of the rectangle. Since the length AB and width BC measures 6 by 8, the area of the rectangle is: 

The area of the triangle is 1/4 of this. Therefore: 

The area of a triangle is half of its base times its height. The base and height of the triangle is DE and DF. Therefore: 

Since DE = DF: 

Thus: 

Since ABCD is a rectangle, ∠D is a right angle. Then by the Pythagorean Theorem: 

Therefore: 

Square: 

Add: 

And finally, we can take the square root of both sides: 
