I CAN'T SEEM TO FIGURE OUT THE SYNTAX.

You don't mention the boolean relationship between these tests (e.g. AND or OR), so here is both cases.  If all three have to be true for the result to be High, then use =IF(AND(A9 >=70, B9 >= 200, C9 = "HIGH"),"High","Low")  However, if A9 is greater or equal to 70 OR B9 is greater than or equal to 200 OR if C9 = High, then use this one: =IF(OR(A9 >=70, B9 >= 200, C9 = "HIGH"),"High","Low").  You could also do it with nested IFs, but this is cleaner and easier.