Answer:
7 ft
Step-by-step explanation:
Perimeter of a rectangle is denoted by the formula: [tex]P=2l+2w[/tex] , where l is the length and w is the width.
We know that P = 20 and that w = 3. So, let's plug these values in:
[tex]20 = 2l+2*3=2l+6[/tex]
Isolate the variable [tex]l[/tex] by subtracting 6 from both sides and dividing by 2:
[tex]2l=20-6=14[/tex]
[tex]l=7[/tex]
Thus, the answer is 7 feet.
Hope this helps!
