Activity 1.5.2b

[rhinopotamus]

The new Activity 1.5.2 is lovely.

However, I was fiddling with it a bit today to make up a new activity about tangent line approximation and came across the following, on part (b). If W'(0.75) = 3.43 liters = 3430 cc, then assuming the tank is cylindrical, the radius of the tank works out to be $\sqrt{\frac{3.43}{\pi}} \approx$ 1.04cm. This is a silly tank.