Q: how do I delete apps from the cloud?

You cannot delete purchased apps "in the cloud". Once purchased (either paid or free), they are in your puchased history and will reside there in case you wish to download them again in the future.

You can't permanently delete any items from your purchase history, but you can hide them so that don't show in the Purchased tab for re-downloading : hiding and unhiding.

As SergZak already states, you can never delete purchases from iCloud. But you can hide the purchases in iTunes on your computer so that you do not have to see them.

iTunes Store: Hiding and unhiding purchases - Apple - Support

Since it took me forever to figure this out, I thought I should post this.

Yes, you can delete and hide it so that when you search it again in the app store it would appear as if you never downloaded it.

1.  Delete the apps from your iPhone or iPad

2.  Then go to iTunes on your Mac (i don't know how it works for PC)

3.  Go to Apps

4.  Go to App Store, and log in with your account.

5.  Click on "Purchase" Link

6.  Click on "All"

7.  Scroll through the screen and find the apps you want to hide

8.  To the left upper corner, you may not see anything, not even an "X", but click on it still

9.  There will be a pop up window asking if you want to hide the app.

10. Say yes, and it will be gone forever.  If you go back to your iPhone or iPad, it won't event show in the purchase history.  If you search for the deleted app, it would show the "GET" icon.  That would look as if you never downloaded the app in the first place. 

Just make sure that no-one has access to your iTunes account, because they can always go to your iTunes and find the purchase history.  That can not be deleted.

Hope that helps

That does not delete them, it only hides them from the cloud - you can log into your account and unhide them : Hide and unhide purchases in iTunes or iBooks on your Mac or PC - Apple Support