Which sentence contains correct punctuation? in my county, the native plant society is forty-nine years old. in my county, the native plant society is forty nine years old. in my county, the native plant society is forty-nine-years old.

In my county, the native plant society is forty-nine years old.

Explanation:

The sentence includes the age of the plant. And the word "forty-nine" is a one word phrase, a compound number that has to be together as they signify the age of the plant. So, the 'hyphen' is used in between 'forty' and 'nine'. While the other sentences' use of the dash (last sentence) or no use of it (second sentence) is wrong. The second use of the hyphen is not required after 'nine'. Thus, the correct answer with the correct punctuation is-

In my county, the native plant society is forty-nine years old.

the maximum speed limit is 55 mph on a two-lane undivided highway and for vehicles towing trailers.

the purpose of a nonfiction text is to give the text a rap up. for example, when i say : frogs are interesting animals is an ending. then when i say: frogs are unique in different ways. that is an intro.