Question

find the perimeter of the rectangle.

Explanation:

Step1: Recall perimeter formula

$P = 2(l + w)$ (where $P$ is perimeter, $l$ is length, $w$ is width)

Step2: Identify length and width

$l = 3x$, $w=x - 7$

Step3: Substitute values into formula

$P=2(3x+(x - 7))$

Step4: Simplify inside parentheses

$P = 2(3x+x - 7)=2(4x - 7)$

Step5: Distribute 2

$P = 8x-14$

Answer:

$8x - 14$