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Last Seven Days

Answer

Good question. Here's an example where I used periods, from the back of the Stylebook. Without periods, it was a lot of words with zero punctuation. Using periods, while not entirely in line with the previous rule, seemed like the better option if the goal was clarity. I guess that means - use your best judgment. If you have to decide between strict adherence to the rule and clarity to your audience, always choose the latter. 

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Answer

Yes - that would fall under this rule in the numerals entry, that says to use figures: 
  • When preceding a unit of measure (inches, pounds, miles, quarts, temperature degrees, etc.) — except for time measurements


Answer

Follow the same guidance on subheads as on headlines. 

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