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If R(x) = 50 + mx and R(8) - R(3) = 45, what is R(0)?

Answer and explanation

Correct answer: 50

For a linear rule R(x) = 50 + mx, the constant term 50 is the initial value and equals R(0), because R(0) = 50 + m(0) = 50. The given difference can be used as a check: R(8) - R(3) = (50 + 8m) - (50 + 3m) = 5m = 45, so m = 9. However, this slope does not alter the value at x = 0. Therefore R(0) = 50, making option C correct. Option A is the slope, while the other numbers confuse the difference or combine values incorrectly.

Related tags

Linear FunctionInitial ValueSlope And InterceptLinear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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