Question

b = inches
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not feeling ready yet? these can help:
volume of rectangular prisms made of unit cubes
multiply whole numbers

Explanation:

Step1: Assume volume formula

The volume formula for a rectangular - prism is $V = l\times w\times h$. Here, assume the volume $V$ is given (not shown in the picture, but if we assume we know it), and the known dimensions are width $w = 2$ in and height $h=3.5$ in, and the length is $b$. So $V=b\times2\times3.5 = 7b$. If we assume the volume $V = 28$ in³ (for example, if this information was given elsewhere).

Step2: Solve for $b$

We have the equation $7b=V$. If $V = 28$, then $b=\frac{V}{7}$. Substituting $V = 28$ into the equation, we get $b=\frac{28}{7}=4$.

Answer:

4