A cylinder has a volume of 254.34 inches cubed. The height of the cylinder is 4 inches. What is the radius of the circle?
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The tangent to at the point (0, 5) has a slope equal to the derivative evaluated at
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This tangent passes through the point (0, 5), so its equation is
The normal line passes through the same point, but is perpendicular to the tangent line, so its slope is the negative reciprocal of the slope of the tangent. So the equation for the normal line is