Maths Crossword Puzzle

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Across
  1. 1. The third angle in an isosceles triangle that has two 17 degree angles.
  2. 3. The net income of a person with a gross annual income of €40 000 who pays tax at 20% and has a tax credit of €3150.
  3. 5. The next term in the sequence 123,116,109,...
  4. 6. The positive solution to 2x^2-3x-70=0 is 6. _ _ _.
  5. 8. If a triangle has two perpendicular sides that are 30cm and 40cm long, what is the length of the third side?
  6. 9. €433 converted to $ if $1=€0.92.
  7. 11. cos(75)=0. _ _ _ _
  8. 12. a+b^2-ac, with a=20, b=-30, and c=0.5
Down
  1. 2. A number that when you double it and subtract 1, you get the same result as adding 41 to the number.
  2. 4. Half of 1.166 million.
  3. 7. The year Mr. Day was born.
  4. 8. If f(x)=2x-12, what is f(300)?
  5. 9. If sin(30)=200/x, what is x?
  6. 10. The second differences of the sequence -5,3,23,55
  7. 13. The positive root of x^2-8x-20.