What happens during an Active object's animation sequence action?

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.

How do we use the sumif formula (when dealing with different formats) ?

While preforming before operation pmcs, you notice the front right tire appears slightly under-inflated. what is the proper action?