If the point $(a, a)$ is placed between the lines $|x + y| = 4$,then

The solution set contained in $R$ of the inequation $3^x+3^{1-x}-4 < 0$ is:

For a positive integer $n$,if $10^{n-2} > 91n$,then the complete set of values of $n$ is:

The set of all real values of $x$ for which $\frac{x^2-1}{(x-4)(x-3)} \geq 1$ is

The region represented by the inequation $x-y \leq -1, x-y \geq 0, x \geq 0, y \geq 0$ is $.....$

Let $a$ $(a < 0, a \notin I)$ be a constant and $t$ be a parameter. Then the set of values of $t$ for which the function $f(x) = \left( \frac{|[t]+1|+a}{|[t]+1|+1-a} \right)x$ is a decreasing function of $x$ (where $[.]$ denotes the greatest integer function) is: