Learn French: L'entreprise a soixante-dix clients.

In French, counting changes a bit after 69. Numbers from 70 to 79 are built by adding to 60 (soixante). So, 70 is literally sixty-ten (soixante-dix), 71 is sixty-eleven (soixante et onze), 72 is sixty-twelve (soixante-douze), and so on.

Why is there a hyphen in soixante-dix?

In French, when you combine words to make a compound number less than 100, you must connect them with a hyphen. The only exception is when they are joined by the word et (and), like in 21 or 71.

Why is it l'entreprise instead of la entreprise?

Entreprise is a feminine noun, so the word for 'the' would normally be la. However, because entreprise starts with a vowel, the 'a' in la is dropped and replaced with an apostrophe. This makes the two words flow together easily.

I've seen à with an accent mark before. Why doesn't a have one here?

They are completely different words! Without the accent, a is the 'he/she/it' form of the verb avoir (to have). With the accent, à means 'at', 'to', or 'in'. Since the company 'has' 70 clients, we need the verb a.