Mathematician's Crossword

1234567
Across
  1. 2. What is the square root of 64?
  2. 4. What is x if x=5+2x?
  3. 5. What is the square root of 256?
  4. 6. What is 93x13?
Down
  1. 1. What is x if 5x+84=16x?
  2. 3. What is x if -(-96)=3x?
  3. 7. What is the square root of 144?