In Paragraphs^x, Hyphens^x, Hyphenation^x

Hello, all. What a great forum! I'm not sure if this is the right spot for this question; if not, let me know. Here's a paragraph I'm working on, in which all numbers are to be written out. I'm confused about the rule on hyphenation when it comes to quantity and as modifiers. Can anyone help? ...

Here's a paragraph I'm working on, in which all numbers are to be written out. I'm confused about the rule on hyphenation when it comes to quantity and as modifiers. Can anyone help? The troublesome paragraph: "...the numbers are staggering: in the mid-nineteenth century, over seventy-five...

Sorry to be so long, but I have been looking for a good comprehensive internet source on dashes; all the information seems to be in bits and pieces, and some of it is quite contradictory. Here is a good excerpt, however, from the Get it Write website: 'A number of you have written to ask us...