Tesla's year end December 31 balance sheets indicate the following: |$ in millions) 2019 2018 Total current assets $34,309 $29,740 Total current liabilities $10,667 $9,993 For the year ended December 31, 2019 what was Tesla's $ change in working capital? Also, if the working capital change was a source of cash place a plus (+) in front of your answer or if the change was a use of cash place a minus (-) in front of your answer. Numeric Response