How can I easily create an app, what would I do first. Please I need urgent response​

Awide variety of “ apps “ are available to customize devices. which category of app does the word processing software fall into?

The graph shows median weekly earnings for full-time workers according to education level. which can you not conclude?

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.