Probably not a real helpful answer, but it is the most correct way I know to explain it.

Since the plant itself is not identified, it is difficult to provide a helpful answer.

Then he waited to get a helpful answer in return.

That question gets a helpful answer about once in a hundred times.

Check here to see if we already have a helpful answer.

But it was more likely to yield helpful answers than what the hell is wrong with you people!

She still couldn't or wouldn't give him any helpful answers.

Thank you so much for that expansive and most helpful answer.

We'd have a hard time getting to him, and no guarantee he'd be in any condition to give us helpful answers even if we did.

Thank you Commissioner for that very comprehensive and helpful answer.