1. The problem is to express the perimeter $p$ of a rectangle in terms of the width $w$ and length $l$. 2. The formula for the perimeter of a rectangle is given by: $$p = 2(l + w)$$ 3. To express $p$ in the form $p = \_\_ w + \_\_ \text{cm}$, we need to distribute the 2: $$p = 2l + 2w$$ 4. This means the perimeter is twice the length plus twice the width. 5. So, the expression is: $$p = 2w + 2l \text{ cm}$$ 6. Here, the coefficient of $w$ is 2 and the constant term involving $l$ is $2l$ cm. Therefore, the perimeter $p$ can be written as $p = 2w + 2l$ cm.