Answer:
formula bar shows the contents of the current cell and allows you to create and view the formulas
Answer:
b.
Explanation:
disguising is a bit of a misleading term here. But basically, yeah, you're replacing one message by an 'encrypted' message, using mathematical rules. To reconstruct the original message, you'll need some key data and the inverse mathematical rules.
Answer:
Variable names in PHP are case sensitive (including the global variables!), although function names are not.