Why must a measurement include a number and a unit

 Hey ! A measurement must include both a number and a unit because a number is meaningless without a unit; a unit describes what the number is measuring.The number specifies the finite value and the unit specifies the increment and describes what is being measured (length, weight, force, etc)..

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square root of 36/6 = 2.449489743

square root of 16/6 = 1.632993162

square root of 6 = 2.449489743

the answer is square root of 16/6 because the square root of 36/6 is the same answer as square root of 6 = 2.449489743

i can answer this if i have the answer choices