In Figure 5.5.5(a) the  tutor has been applied to the graph of $y\=e^{-x}$ rotated about the $y$-axis. Note how $e^{-x}$ is entered into the tutor as $\exp \left(-x\right)$. Moreover, to calculate with the exponential function, the exponential $e$ must be entered from a palette (e.g., Common Symbols) or via command completion (Tools menu, or the Escape key).

The Plot Options section has been used to impose one-to-one scaling, and the frame axis style.

An exact representation of the value of the surface-area integral is not available, so the tutor provided just a floating-point approximation.

Expression palette: Definite-integral and derivative templates
Press the Enter key.

Context Panel: Approximate≻10 (digits)

Tools≻Load Package: Student Calculus 1