Having to Do with Work

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Across
  1. 1. a combined action
  2. 4. a measuring device that measures muscle work
  3. 5. broken
  4. 9. root work
  5. 10. lacking energy
  6. 12. a musical drama
Down
  1. 1. a combined effect greater than the separate effects
  2. 2. the object operators work on in math
  3. 3. root to work, produce
  4. 6. a large scale artistic work
  5. 7. designed to provide comfort and efficiency at work
  6. 8. a symbol in a mathematical function
  7. 11. suffix having to do with; similar to; having the nature of