at least thirty pages
not many students
Are at least thirty and not many determinative phrases in the NPs above?
The words ‘at least thirty’ do not constitute a syntactic unit. ’ ‘not many’ is indeed a determinative phrase.
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The words ‘at least thirty’ do not constitute a syntactic unit. Rather, ‘at least’ is a prepositional phrase modifying the smaller noun phrase ‘thirty pages,’ in which ‘thirty’ is determiner to ‘pages.’
‘not many’ is indeed a determinative phrase.
On reflection, I think you got it right - ‘at least thirty’ is most probably better considered a DP after all. I was thinking of another, superficially similar construction. Please excuse my rushed reply.