How many businesses advertise with Google Adwords or Adsense?

There is no way to actually have an accurate number because it fluctuates every single day as new businesses sign up and cancel their accounts.

Adsense can work very well if you have moderately heavy traffic. If you're selling something, it's even better. There is nothing bad I can say about it... it doesn't cost you anything, so you either make money or you don't, without anything negative on your part. Try it, you can always close the account. Good luck.

due to the business advertising options created by the google they are many businesses advertise with google adwords or adsense.google adwords is the best place where you can earn money and you can also increase traffic to your website.