R U SMARTER THAN IN 2k15?

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Across
  1. 6. Powerhouse of a eukaryotic cell
  2. 9. Average number of births per woman needed for a population to replace itself, accounting for deaths and infertility (two words)
  3. 11. School of economic thought that argues that government intervention can stabilise the economy
Down
  1. 1. Stored energy an object has due to its position, configuration, or state, representing the capacity to do work
  2. 2. The player that prevents others from scoring in handball
  3. 3. Archduke Franz Ferdinand murder location
  4. 4. Strong chemical bond where two atoms share one or more pairs of electrons
  5. 5. Solve for x:2*sqrt(3x+71) = 14 (two words)
  6. 7. Co-author of "The Communist Manifesto"
  7. 8. Name of building hosting live music night
  8. 10. "Brick Lane" author (second name only)