Posted: September 13th, 2017

Safer than Safe

-Quantitative reasoning assignment
Project instructions:
Your homework assignment is to read about Problem Solving from the PDF that I uploaded.

Then do problem 1.8.17. bellow

THEN identify the stages Polya described in your solution process.

Did you skip any steps? Do you think you did those steps and just didn’t realize it? Write a paragraph reflecting on how your method for solving this problem was similar and dissimilar to Polya’s guidelines.

Also respond – honestly – to if you believe Polya’s guidelines will be helpful to you to think about the next time you encounter a difficult problem.

Exercise 1.8.17. [S][Section 1.3] [Goal 1.2] [Goal 1.4] [Goal 1.5] Brush your teeth twice a day { but turn
o_ the water
The Environmental Protection Agency states that
You can save up to 8 gallons of water by turning o_ the faucet when you brush your teeth in
the morning and before bedtime. 30
(a) Estimate how much water a family of four would use each week, assuming they left the water running
while brushing.
(b) Estimate how much water would be saved in one day if the entire United States turned o_ the faucet
while brushing.
(c) Put your answer to the previous question in context (compare it to the volume of water in a lake or a
swimming pool, for example.)
(d) Realistically, you need some water to brush your teeth because you need to get the toothbrush wet
and you need to rinse the brush and your teeth. Estimate how much water that involves, per brushing,
then redo the estimate in part (b).

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