Answer to Question #270265 in Algebra for pica

Question

Explain the difference between round and hard brackets when expressing intervals. Use an example to justify

Answer 1

Lets look t interval (a, b]. This brackets means that every number between a and b is in this interval, including b but excluding a. For example, some posts has a restriction on the size of the box you want to send. Lets say, the height of the box cannot be greater than 50cm. So, if h is a height of the box, then we can tell that $h\in (0,50]$. We include number 50 because post allows it and exclude value 0 because height of the box cannot be equal to 0, that doesn't make physical sence