The man opened his mouth, but found nothing else to say; he looked at her in bewilderment, wondering why the formula had failed.

The formulas also fail to reflect adequately the added costs of dealing with difficult students or those lacking English language skills.

The formula also fails to address the level of toxicity associated with a process.

This was once when The Shadow's formula failed.

And when ten chemists analyze why a formula failed, all of them will give you the same (correct) answer.

The formulas above fail when the point is a singular point.

This formula can fail when one of these conditions is not true.

The formula has failed, or I have failed the formula.

Even that generous formula has failed to keep up with the disparities, however.

The editors don't know why the formula failed but expect to have it worked out by the next ranking, in 2004.