Answer:
- The simplified expression is:

- The simplified expression is undefined for m=3
Explanation:
The given expression is:

The numerator can be siplified by using factorization and denominator will be simplified using the formula

So,

A fraction is undefined when the denominator is zero. In order to find the value of m on which the simplified fraction will be undefined we will put denominator equal to zero.
So,

Hence,
- The simplified expression is:

- The simplified expression is undefined for m=3
Answer:
Modern browsers use CSS to style all their markup.
How would they render a <table> element if CSS had nothing that could express the appearance of one?
(That, and you might have non-tabular data that you want to render like a table, there are enough people using tables for layout to see a demand for it).
They can be used to format content in a tabular manner when the markup does not use the table element, e.g. because the markup was written by someone who was told not use tables or because the markup is generic XML and not HTML.
You can also design a page using e.g. div elements so that some stylesheet formats them as a table, some other stylesheet lets them be block elements or turns them to inline elements. This may depend e.g. on the device width
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