Answer:
[tex]P = 2(l+w)\\Length = 5x\\Width = 3x+7\\\\P = 2(5x +(3x+7))[/tex]
Step-by-step explanation:
Further Solving :
[tex]P = 2(5x +(3x+7))\\P = 2(5x+3x+7)\\P = 2(8x+7)\\\\Perimeter = 16x + 14[/tex]
