The radius of a circle is $x+6$ and its diameter is $3x+5$. What is the circumference of the circle, in terms of $\pi$? (Do not include the variable $x$ in your answer.)
But first, I need to make sure that the radius and the diameter are consistent with each other, since they are both given in terms of $x$. By definition, the diameter is twice the radius, so I can write the equation $3x+5 = 2(x+6)$ and solve for $x$. Expanding and simplifying, I get $3x+5 = 2x+12$, then $x = 7$. So the radius of the circle is $x+6 = 7+6 = 13$ and the diameter is $3x+5 = 3(7)+5 = 26$. Therefore, the circumference is $26\pi$. 