SUMIF? Question

I am trying to write a formula to sum up numbers within the last 30 days in a sheet summary. So my argument =SUMIF([Entry Date]:[Entry Date], ">" TODAY() -30,[House Holds Served]:[House Holds Served]). Honestly I am still very new to formulas and have gone through the Academy online for this step but it is still showing as unparseable. You guys helped me with my last question and I figured this would be easier to figure out but it is not.


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