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If (R(x)=90+mx) and (R(11)-R(5)=78), what is (R(0))?

Answer and explanation

Correct answer: (90)

The expression \(R(x)=90+mx\) is linear, and its value at \(x=0\) is simply its constant term. When zero is substituted, the term \(mx\) becomes zero. This means that the initial value is independent of the slope. The condition involving \(R(11)-R(5)\) is an additional check and can determine \(m\), but it is not needed for the requested value.

Calculate directly: \(R(0)=90+m(0)=90\). Therefore option C is correct. For completeness, \(R(11)-R(5)=(90+11m)-(90+5m)=6m=78\), so \(m=13\). The number 13 is the rate of change, while 78 is the change between the two specified inputs. Neither should be confused with the intercept, which is 90.

Related tags

Linear GrowthInitial ValueRate Check

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