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If (F(t)=18+rt) and (F(2)=30), what is (F(5))?

Answer and explanation

Correct answer: 48

Given F(t)=18+rt and F(2)=30, we get 18+2r=30. Thus, 2r=12 and r=6. Now, F(5)=18+6×5=48. Therefore, 48 is the correct answer. The value 42 would result from using t=4, so it is not correct here. Exam tip: first find r from the given function value, then substitute the required value of t.

Related tags

Linear FunctionLinear GrowthFind RateFunction EvaluationAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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