test 3

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Across
  1. 4. The expression under a square-root sign
  2. 6. Describing a function where the range equals the codomain
  3. 8. The three-dimensional surface formed by rotating a parabola around its axis of symmetry.
Down
  1. 1. Discrete-time equivalent of the Laplace transform
  2. 2. Describing a square matrix that has no inverse because its determinant is zero.
  3. 3. Target set into which a function's outputs are constrained to fall
  4. 5. The fixed line from which all points on a parabola are equidistant to the focus
  5. 7. The ordinate of a point on the parabola y² = 4ax in terms of a and t