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If R(x) = 110 + mx and R(12) - R(6) = 90, what is R(0)?

Answer and explanation

Correct answer: 110

The governing concept is the initial value, or y-intercept, of a linear function. Use the given difference first: R(12) − R(6) = (110 + 12m) − (110 + 6m) = 6m. Since this difference is 90, 6m = 90 and m = 15. However, the question asks for R(0), not for the slope m. Substituting x = 0 into the original function gives R(0) = 110 + 15(0) = 110. Therefore option C is correct. Option A is the slope, while option B is the stated change between the two inputs. Option D has no valid algebraic basis and would result from combining unrelated quantities instead of evaluating the function at zero.

Related tags

Linear FunctionInitial ValueSlope InterceptLinear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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