MathMania 2013 Answers

  1. The price decreases 12%.

  2. You have 30 dimes.

  3. The angle between the hands is 130 degrees.

  4. The value is 18.

  5. k = 7.

  6. x = −1, −2, (3 ± √17)/2.

  7. The area of the small square is 1/13.