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# Chapter 9: Present a Problem

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on 22 March 2013

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#### Transcript of Chapter 9: Present a Problem

Classic Mustangs PSB # 3 Adding Chlorine Volume of the pool is pi*r^2 *h
r = C/2pi
Volume = pi * (c/2pi)^2 * h
= h* C^2 / 4pi
= 21 inches * (27 feet 3 inches)^2 / 4pi
= 0.53337m * (8.30539m)^2 /4pi
= 53.337 cm * (830.539 cm)^2 / 4pi
= 2927785 cubic centimeters.
= 2927785 mililiters.
= 2927.785 liters
= 772.5 gallons

16 fluid ounces per 10,000 gallons gives:
772.5/10000 = x/16
x = 772.5 * 16 / 10000
x = 1.236 fluid ounces.
Measuring to the nearest quarter of a fluid ounce, that is 1.25 fluid ounces. How to Solve How to Solve Ricardo and Maritza WS # 9 WS #7 By, Poli, Diana, and Rowdy Math Problems Ricardo kept saving pennies. Everyday, he saves the same number of pennies as the day's date. (for example, 12 pennies on March 12). Maritza did the something different. She saved 5 cents on the first day of the month. Then she saved 5 cents more each day than she had the previous day. At the end of March, who had saved more money, and how much more money was it? Diagonals of a Polygon WS # 2 A certain convex polygon has 14 sides. How many diagonals can be drawn? How to Solve . We only liked old Mustangs from 1964 1/2 through the 1968 model year. When we found out that the collection of Mustangs from the Sparks Auto Museum was going to be auctioned off, we put our minds and our money together. Instead of bidding against each other, we decided to bid as a group on each Mustang available. We set a maximum price we would bid, and quite frankly, none of us had any favorites, we loved them all equally. They also agreed to dived "our take" as follows: 1/2 to Travis because he was usual's the big money on our projects, 1/4 to Sandra as she was usually the brains that got things done, and I was to get a 1/6 share. In the end we were the winning bidders on 11 mustangs. How many Mustangs do each of us get? How to Solve Travis gets 6 cars, Sandra gets 3, and the narrator gets 2. I came to these numbers by rounding up the decimals and by attempting this on a simpler problem. One of the strategies used for this is splitting up the problem into smaller components (figuring out how much each person gets before combining the total numbers) THE END I have a small circular swimming pool in my backyard for my kids. Last weekend, I set it up and bought chlorine to put into it. The directions on the bottle said to put in 16 fluid ounces of chlorine per 10,000 gallons of water. Of course, our pool holds a lot less water than 10,000 gallons, so I needed to figure out the correct amount of chlorine to put in it. I measured the pool and found it to have a circumference of 27 feet 3 inches and a water height of 21 inches. I knew that the circumference of a circle was C=2-pi-r and the volume of a cylinder was V=pi-r-squared-h (r is the radius of the cylinder, and h is the height). I knew that the milliliter is a cubic centimeter. I also knew that there are 3.79 litres in 1 gallon, and 3.281 feet in 1 meter. How many fluid ounces of chlorine did I need to put into the pool? (I have a measuring spoon capable of measuring to the nearest quarter of a fluid ounce.) There is a formula! n(n-3)/2

n= number of sides in a polygon

(14) * ((14) -3) /2 = 77

There can be 77 diagonals
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