PBA 2 Practice Question Grade 8 Mathematics - SkillBuilder + MAP Rehearsal

Grade 8 Mathematics - SkillBuilder + MAP Rehearsal PBA 2

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John and Gina are ordering the following set of real numbers from least to greatest: {-7, 3/2, √9, π, -1/2 }. John said that they should go in the following order {-1/2 , -7, π, √9, 3/2 }.
Gina says they should be in the following order: {-7, -1/2 , 3/2 , √9, π}.
Who is correct and why? Write your answer in complete sentence(s) below.