Answer
$(-\infty ,5)$
Work Step by Step
$11x\lt10x+5$
Solve for x by subtracting 10x om each side.
$11x-10x\lt10x+5-10x$
$x\lt5$
This is written in interval notation as $(-\infty , 5)$
The use of ) indicates that the possible values of x approach 5, but 5 itself is not in the set of possible values for x.