Mathy McMathface

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Across
  1. 3. Number of hypercube unfoldings
  2. 4. 3^3 + 4^4 + 3^3 + 5^5
  3. 6. √144
  4. 7. 2x+420=558
  5. 8. 84x5
  6. 11. First ten digits of pi
  7. 13. 11th Fibonacci number
  8. 14. a^2/5=20
  9. 15. 1089x9
Down
  1. 1. 1^3 + 5^3 + 3^3
  2. 2. Largest negative integer
  3. 3. 2^5 x 9^2
  4. 5. Number of seconds in an hour
  5. 6. the number of spheres touching any other sphere in a 24-dimensional Leech lattice
  6. 9. 8^20÷2
  7. 10. 0.0212x10000
  8. 11. MMMCMXCIX
  9. 12. 20x100+23
  10. 14. 10^3