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If \(f(x)=x+12\) and \(g(x)=x+3\), what is \(\left(\frac{f}{g}\right)(3)\)?

Answer and explanation

Correct answer: \(\frac{5}{2}\)

The direct answer is A, \(\frac{5}{2}\). The quotient function is \(\left(\frac{f}{g}\right)(3)=\frac{f(3)}{g(3)}\). Find the numerator: \(f(3)=3+12=15\). Find the denominator: \(g(3)=3+3=6\). Thus \(\frac{15}{6}\) simplifies by dividing numerator and denominator by 3 to \(\frac{5}{2}\). Option A is correct. Option B, 5, is not the value of the fraction. Option C, \(2/5\), is the reciprocal of the correct answer, so numerator and denominator have been reversed. Option D, 3, ignores the quotient operation. Also, the denominator 6 is not zero, so the value is defined. Remember: numerator first, denominator second.

Related tags

AlgebraReal FunctionsQuotientSimplification

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