What is the special set of characters that indicates the start and end of an HTML element and that element's type?

What kind of motivation is katrina showing? use the drop-down menu to complete the statement. katrina is using motivation because she is personally interested in learning more.

Pp 4.1 design and implement a class called sphere that contains instance data that represents the sphere’s diameter. define the sphere constructor to accept and initialize the diameter and include getter and setter methods for the diameter. include methods that calculate and return the volume and surface area of the sphere (see pp 3.5 for the formulas). include a tostring method that returns a one-line description of the sphere. create a driver class called multisphere, whose main method instantiates and updates several sphere objects.

What is a point-in-time measurement of system performance?