A circle has a radius of 2.1 inches. The area of the circle is b π

The correct answer is $4.41$. The area, $A$, of a circle is given by the formula $A=\pi r^2$, where $r$ is the radius of the circle. It's given that the area of the circle is $b\pi$ square inches, where $b$ is a constant, and the radius of the circle is $2.1$ inches. Substituting $b\pi$ for $A$ and $2.1$ for $r$ in the formula $A=\pi r^2$ yields $b\pi =\pi \left({2.1}^2\right)$. Dividing both sides of this equation by $\pi$ yields $b=4.41$. Therefore, the value of $b$ is $4.41$.