apps that worked perfectly fine today are now greyed out when i connected to wifi and i cannot delete the app, and it just says "waiting" please help

It would appear that you have an app or two "Stuck" in the download phase

There are a couple of ways of dealing with this - they are summarized in this thread

Downloading apps stuck on waiting...

Try resetting the App Store:

Close the App Store completely from the app switcher window by double clicking the Home button and swiping up the App Store preview pane until it disappears from the screen. You may have to look for the App Store pane by scrawling to the left.

Then sign out of the iTunes Store (in Settings).

Then do a forced restart. Hold down the Home and Wake/Sleep buttons at the same time for about 15-20 seconds until the Apple logo appears.

Then sign back into the iTunes Store.

See if the app is gone or if you can delete and reinstall it now.

Did you follow the steps in the order I recommended? It makes a difference.

Give it a bit and see if it finishes. If not have you tried downloading it via iTunes?

Thanks for posting your solution

Glad it worked out for you