algebra

123456789
Across
  1. 2. 3(x+4)=27
  2. 5. the sum of angles in a quadrilateral
  3. 8. the number of sides in a triangle
  4. 9. 2x+3=11
Down
  1. 1. 2x+5=15
  2. 3. the number of degrees in a right angle
  3. 4. 5y-7+18
  4. 5. the perimeter of a rectangle with length 7 and width 5
  5. 6. 4(x-3)=20
  6. 7. the number of parallel sides in a trapezoid