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What is the solution of 0.4x + 1.2 ≤ 3.6?

Answer and explanation

Correct answer: x ≤ 6

This is an algebraic linear inequality in one variable. First subtract 1.2 from both sides: 0.4x ≤ 2.4. Since 0.4 is positive, dividing by it does not reverse the inequality sign. Therefore x ≤ 2.4 ÷ 0.4 = 6. The endpoint 6 is included because the original sign is ≤, so the answer is option C. Option A reverses the direction incorrectly, option B excludes the valid endpoint and uses the wrong direction, and option D results from an arithmetic error. Equivalently, using fractions, 0.4 = 2/5 and 2.4 = 12/5, giving (2/5)x ≤ 12/5 and hence x ≤ 6. The solution set is (-∞, 6].

Related tags

Linear InequalitiesDecimalsOne VariableAlgebraic Solution Of Linear Inequalities In One VariableMathematicsClass 11 Mcq

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