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Chapter 9: Problem 73

Select the best estimate for the measure of the given item. The width of an electric cord a. \(4 \mathrm{~mm}\) b. \(4 \mathrm{~cm}\) c. \(4 \mathrm{dm}\) d. \(4 \mathrm{~m}\)

Short Answer

Expert verified
The best estimate for the width of an electric cord is 4cm (option b).

Step by step solution

01

Use your prior knowledge

Using your prior experience and knowledge about the size of an electric cord, you know that it's small in diameter, but definitely bigger than something like a human hair.
02

Compare with the options

Now you have to compare your mental picture of an electric cord with the options given: 4mm, 4cm, 4dm and 4m. We know an electric cord cannot be 4 meters or 4 decimeters in diameter as those are too large, so we rule out options c and d. Now we are left with 4mm and 4cm.
03

Make the final decision

At this point, recalling that 1cm has 10mm, we evaluate our remaining options. 4mm might be too small for an average electric cord, while 4cm, which is the same as 40mm, seems to be a more reasonable size for an electric cord. So, we pick option b, which is 4cm.

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