Final answer:
Hannah Höch's combination of parts of photographs to produce 'The Multi-Millionaire' is a form of art known as photomontage.
Step-by-step explanation:
Hannah Höch's combination of parts of photographs to produce 'The Multi-Millionaire' is a form of art known as photomontage. Photomontage is a technique where different images are cut, rearranged, and combined to create a new composition. Höch used this method to reflect the chaos of modern life and convey feminist ideas in her artwork.