Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 9 - Measurement - 9.2 Measuring Area and Volume - Exercise Set 9.2: 64

Answer

The best estimate is b. $2050~cm^2$

Work Step by Step

If the television screen had a width of 50 mm and height of 40 mm, the area would be $2000~mm^2$. Since this screen would be too small, answer a. $2050~mm^2$ seems unreasonably small. If the television screen had a width of 50 cm and height of 40 cm, the area would be $2000~cm^2$. Since the height and width of this screen seem reasonable, answer b. $2050~cm^2$ seems like a good estimate. If the television screen had a width of 50 dm and height of 40 dm, the area would be $2000~dm^2$. Since the height and width of this screen would be several meters, this screen seems too large. Therefore, answer c. $2050~dm^2$ seems unreasonably large. The best estimate is b. $2050~cm^2$
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