If f(x) = 4x - 7, what is f(3)?

Substitute x = 3: f(3) = 4(3) - 7 = 12 - 7 = 5.

A store marks up an item by 25% and sells it for $50. What was the original cost?

If cost × 1.25 = $50, then cost = $50 ÷ 1.25 = $40.

Absolute values give 15 + 8 - 6 = 17.

Subtract 3x from both sides to get 2x + 3 = 11, then 2x = 8, so x = 4.

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What is the least common multiple (LCM) of 8 and 12?