What is a null pointer exception in java.

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

In microsoft word, when you highlight existing text you want to replace, you're in              a.  advanced mode.    b.  automatic mode.    c.  basic mode.    d.  typeover mode

Verify each identity[tex] \frac{csc}{cot \: x \: + \: tan \: x} = cos \: x[/tex]