12.5 because a half of 100 is 50 so 12.50
The area of the desktop is 12. 5 feet square
<h3>How to determine the area</h3>
The formula for area of a rectangle;
Area = length × width
Length = 2. 5 feet
Width = 5 feet
Area = 2. 5 × 5
Area = 12. 5 feet square
Thus, the area of the desktop is 12. 5 feet square
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X= -213/10 , look at the steps in the picture
The staircase represents a constant rate of change because the height of the staircase is always going up or down, or changing. Each time the staircase goes up by a certain number, it always goes up by the same number and is therefore a constant rate of change.