all about maths

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Across
  1. 2. 2x+3y=8z......!?
  2. 3. An angle less that 90 degrees.
  3. 7. The number under a vinculum?
  4. 10. What has 12 sides, 8 vertices and 6 faces?
  5. 11. A 5 sided shape with equal angles internally.
  6. 13. The maths all American students hate!
  7. 15. A number only divisible by itself and 1.
  8. 16. An amazing subject!
  9. 17. 11111101001
Down
  1. 1. What do I need when solving 23748/39?
  2. 4. An arrangement of shapes and lines (relates to an area in maths).
  3. 5. From the highest to the lowest, you can find the...?
  4. 6. The number before a variable (eg. the 3 of 3x).
  5. 8. The point where a graph touches an axis.
  6. 9. An object used to tell direction.
  7. 10. Two numbers that tell you the exact location on a graph.
  8. 12. Who had an apple fall on his head?
  9. 14. Cutting a pizza in pieces is [...] the pizza.