**Category 39 Example 2** - mental math

The midpoint of the two numbers can be determined using mental math = 65. Match this to the expression within the absolute value pipes.

The distance of the midpoint from each number will be same and can be determined using mental math = 15. Match it to the number that is right of the inequality operator.

**Category 40 Example 1** - no calculation required

The shift of the vertex (right, left, up, down) from (0, 0) can be determine by looking at the graph. Match this shift to the vertex in the answer choices.

**Category 40 Example 2** - mental math

Look at the values of f(x) from the table for the two values of x and subtract. Absolute value is always positive. Hence |-3| = 3.

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