What is the slope of the line passing through (2, 3) and (6, 11)?

Slope = (11 − 3) / (6 − 2) = 8 / 4 = 2.

12 × 12 = 144, so √144 = 12.

If a cylinder has radius 3 and height 5, what is its volume? (Use π ≈ 3.14)

V = πr²h = 3.14 × 9 × 5 = 141.3.

x² − 9 is a difference of squares: (x − 3)(x + 3).

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What is the least common multiple (LCM) of 6 and 8?