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If (C(t)=180-7t) and (D(t)=60+5t), at what (t) will (C(t)) be (12) less than (D(t))?

Answer and explanation

Correct answer: (t = 11)

“12 less than (D(t))” means (C(t)=D(t)-12). Therefore, (180-7t=60+5t-12). Simplifying gives (180-7t=48+5t), so (132=12t) and hence (t=11). Therefore, option C is correct. At (t=10), the difference between the two functions is not 12. Exam tip: In “less than” questions, subtract the stated difference from the reference expression first.

Related tags

Linear FunctionsLinear Growth And DecaySolving Linear EquationsFunction ComparisonPolynomialsIntroduction To PolynomialsMathematicsClass 9 Mcq

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