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If (M(t)=m+5t) and (M(2)=25), what will (M(6)) be?

Answer and explanation

Correct answer: 45

Given \(M(t)=m+5t\). Substituting \(t=2\), we get \(M(2)=m+10=25\), so \(m=15\). Now, for \(t=6\), \(M(6)=15+5\times6=45\). Hence, 45 is correct. The nearby option 40 can result from incorrectly counting the growth; from \(t=2\) to \(t=6\), the increase is \(5\times4=20\). Exam tip: first use the given condition to find the unknown constant \(m\), then substitute the required value.

Related tags

Linear FunctionsLinear GrowthSubstitutionAlgebraic ExpressionsPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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