During a school CCA event, the leftover allowance in dollars after buying coffees can be calculated using the expression $6k - 9$, where $k$ is the number of teachers attending. Find the value of $6k - 9$ when $k = 4$.
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Worked Solution
Step 1: Substitute k = 4 into the expression: 6(4) - 9.\n
Step 2: Multiply first (order of operations): 6 × 4 = 24.\n
Step 3: Subtract: 24 - 9 = 15.
Answer: 15
Correct answer: 15
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