Answers

1. Answer:

     (b)  2.175 miles to 2.185 miles

   Step-by-step explanation:

   When a value is rounded, the original “exact” value is presumed to be within 1/2 of the value of one least-significant unit of the rounded number.

   Application

   A rounded value of 2.18 has a least-significant digit with a place value of 0.01 units. Half that value is the “margin of error”. That is, the range of numbers that would be rounded to 2.18 is …

     2.18-0.005 ≤ x < 2.18+0.005

     2.175 ≤ x < 2.185 . . . . miles

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