Answer:
16,800 dollars
Step-by-step explanation:
1. find 20 percent of 21,000= 4,200
2. subtract 4,200 from 21,000
21,000
-4,200
16,800 dollars
X= -1
2x+4-x=x+3-x subtract x from both sides
x+4=3
x+4-4=3-4 subtract 4 from both sides
Therefore, x=-1
For this case we have that by definition, the perimeter of a rectangle is given by:

Where:
l: It is the length of the rectangle
w: It is the width of the rectangle
According to the image we have:

So, rewriting the perimeter expression we have:

Applying distributive property to the terms within parentheses we have:

Answer:
The perimeter of the rectangle is: 
7x +2x+27 = 180
9x +27 = 180
-27 -27
9x = 153
÷9. ÷9
x = 17
ANSWER: B