Final answer:
The total dollar amount of assets classified as investments cannot be determined without further information.
Step-by-step explanation:
The total dollar amount of assets to be classified as investments depends on the specific context and definition used. In the given information, the home equity held by U.S. households is mentioned to be $11.3 trillion at the end of 2015. However, without further clarification, it is difficult to determine the precise amount of assets classified as investments.