The wallpaper will ned need for rhe wall 105 square feet.
What is the area of the door?
The area of the door is given by;
\(\rm Area =length \times width\)
Ned wants to wallpaper the wall of his bedroom that has the door.
The wall is 14 feet wide and 9 feet high.
The door is 3 feet wide and 7 feet high.
The area of the wall is;
\(\rm Area =length \times width\\\\\rm Area =14\times 9\\\\Area=126\)
The area of the door is;
\(\\\rm Area =length \times width\\\\\rm Area = 7\times 3\\\\Area=21\)
The square feet of wallpaper will ned need for rhe wall is;
\(\rm = Area \ of \ wall - Area \ of \ door\\\\= 126-21\\\\=105\)
Hence, the wallpaper will ned need for rhe wall 105 square feet.
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