Update using-helpers-concept.md (#24)

Adding in a description of the new math functions to using-helpers-concept.md
microsoft · Apr 13, 2020 · 1f9c0b7 · 1f9c0b7
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@@ -102,3 +102,6 @@ To get location, room, and building, you could use the following DataType templa
 "{{replace PV1-3-2 '\d+' ''}}"
 ],
 ```
+## Mathematical Functions
+
+We have included mathematical helper functions so you can do basic math. Some of these functions are addition, subtraction, a random number generator and maximum/minimum finders.