R U SMARTER THAN IN 2k15?

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Across
  1. 4. Solve for x: 2*sqrt(3x+71) = 14
  2. 7. average number of births per woman needed for a
  3. 9. Archduke franz ferdinand murder location
  4. 10. Powerhouse of a eukaryotic cell
  5. 12. "Brick Lane" author
  6. 13. Strong chemical link where two atoms share one or more pairs
Down
  1. 1. or state, representing the capacity to do work
  2. 2. can stabilize the economy?
  3. 3. to replace itself, accounting for deaths and infertility
  4. 5. stored energy an object has due to its position,
  5. 6. School of economic thought argues that government
  6. 8. Co-author of "The Communist Manifesto" with Karl Marx?
  7. 11. Name of building hosting live music night
  8. 14. electrons