SSAT Math Practice Test 57: Functions

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1. For all real numbers n, $n = 10n - 10.

$7 =

  • A. 70
  • B. 60
  • C. 17
  • D. 7
  • E. 0

2. For all real numbers n, $n = 10n - 10.

If $n = 120, then n =

  • A. 11
  • B. 12
  • C. 13
  • D. 120
  • E. 130

3. For all real numbers d and y, d ? y = (d × y) - (d + y).

[Example: 3 ? 2 = (3 × 2) - (3 + 2) = 6 - 5 = 1]

10 ? 2 =

  • A. 20
  • B. 16
  • C. 12
  • D. 8
  • E. 4

4. For all real numbers d and y, d ? y = (d × y) - (d + y).

[Example: 3 ? 2 = (3 × 2) - (3 + 2) = 6 - 5 = 1]

If K (4 ? 3) = 30, then K =

  • A. 3
  • B. 4
  • C. 5
  • D. 6
  • E. 7

5. For all real numbers d and y, d ? y = (d × y) - (d + y).

[Example: 3 ? 2 = (3 × 2) - (3 + 2) = 6 - 5 = 1]

(2 ? 4) × (3 ? 6) =

  • A. (9 ? 3) + 3
  • B. (6 ? 4) + 1
  • C. (5 ? 3) + 4
  • D. (8 ? 4) + 2
  • E. (9 ? 4) + 3