In 2000 Jenny Thompson set a swimming record of 56.80 seconds for the 100-meter butterfly. If her goal is to lower this record by a hundredth of a second, what will the new record be?

Here is the math info, you do the math.
One mm is one "millimeter" or one one-thousandth of a meter (1 mm = 1/1000 m).

One cm is one "centimeter" or one one-hundredth of a meter (1 cm = 1/100 m).

Therefore, 1 cm = 10 mm. To convert mm to cm, divide the number of mm by 10 to get the number of cm

Not at all. 'Centi' means hundredths, so a centimeter is a hundredth of a meter. There are 100 centimeters in a meter, just as there are 100 centigrams in a gram, 100 centiliters in a liter, and so forth.

The butterfly stroke is a really fun one in swimming but it's hard to explain so take a look at this YouTube video which explains how to do it.
http://www.youtube.com/watch?v=AviVdYspKLQ

There are several different rounding schemes, but by the most common it would be 57.50 and 58.49 .

fastest 57.50, slowest 58.49

As a alternative to the cell, you could add chlorine, temporarily ... so the kids could swim right away.

If the manufacturer recommends vinegar, that is what you should use. Some people say muratic acid is effective in cleaning the device. Try cleaning another night.

Evidently, your water was on the acid side ... evidenced by the report from your pool professional.

In establishing good water balance, first it is important to remove all metals ... Second, get alkalinity set (anywhere between 80 and 120 with 100 being the goal). Next, pH should be set. 7.2 to 7.8 is a pretty wide range. 7.4 is the goal. Chlorine should now be introduced and 4 ppm is a good number but you can go higher, Some US States allow as high as 10 in commercial spa and hot tub situations. In your case, the chlorine you are making (or not making in the present situation) is not protected by Cyanuric Acid (sun screen for chlorine). Also called Stabilizer, any number between 50 and 100 is ok. 80 is the goal. With no Cyanuric Acid "protection", your chlorine will be gobbled up almost as quickly as you make it. Note, grandular type chlorine normally comes with Cyanuric Acid as an ingredient. Numbers above 100 should be avoided. Since the acid is persistent, the only way to get the excess out of the pool is to remove some water, which will also remove calcium and salt. Just be aware ...

Do you know what the salt rquirement is? The content of your pool? One particular manufacturer I am famliar with wants 2800 to 3400 PPM with 3200 being the goal. At that level, this particular manufacturers (not yours) device operates most effectively. I say this to stress you should be aware of the Intex standard and where your salt level is. You can measure this with a special kit from Taylor or you may have your pool professional check it for you.

Enjoy your pool - I hope this information is helpful. Thank you for your question @ FixYa.com

I suppose its possible both mass air flow sensors were bad but to have failed the same way is not that likely, the part that came to mind on this one would be A throttle position sensor (TPS) located at throttle body (butterfly) and is reostat which tells computer the psition of butterfly opening. when these go out in a specific spot, they will cause speed or rpm fluctuations at bad spot.

To change the height/weight/age, hold the user # you want to change it for and the set/save button at the same time for a few seconds.

I am #2, so I hold the 2 button and set/save. Then you can use scroll to change the numbers/options, and set when you have properly set the digit.

First it does height, then age, then gender, then if you want a goal, and then what that goal is.