How do I find the rank-k approximation of an image

Which cultural aspect does this type of song best portray? a german polka dance

Which company provides a crowdsourcing platform for corporate research and development? a: mtruk b: wiki answers c: mediawiki d: innocentive

What is estimated time of arrival (eta)? a device that measures the acceleration (the rate of change of velocity) of an item and is used to track truck speeds or taxi cab speeds a gps technology adventure game that posts the longitude and latitude location for an item on the internet for users to find a north/south measurement of position the time of day of an expected arrival at a certain destination and is typically used for navigation applications