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<em>-</em><em> </em><em>BRAINLIEST</em><em> answerer</em>
Answer:
f(3) = 45
Step-by-step explanation:
Substitute x = 3 into f(x) and evaluate
f(3) = 15 × 3 = 45
The theater department sold 102 tickets each night,because 2142÷ 3 nights = 714. 714 ÷ 7=102