Final answer:Rational numbers can be expressed as fractions or terminating/repeating decimals. √81, -12, and 6.54 are all examples of rational numbers.Explanation:Numbers that are rational can be expressed as fractions, where the numerator and denominator are both integers. Rational numbers can also be expressed as terminating or repeating decimals. Let's analyze each option:A. √81: This is equal to 9, which is a rational number because it can be expressed as 9/1.B. √50: This is an irrational number because the square root of 50 cannot be expressed as a fraction or a terminating/repeating decimal.C. -12: This is a rational number because it can be expressed as -12/1.D. 6.54: This is a rational number because it can be expressed as 654/100, which simplifies to 327/50.Based on this analysis, the rational numbers are:Option A: √81Option C: -12Option D: 6.54...

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