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Two related rates problems |
2005-12-29 |
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Shimaera pose la question :
#1. A manufacturer determines that the cost of producing x of an item is C(x)=0.015x2+12x+1000 and the price function is p(x)=250+2x/10. Find the actual and marginal profits when 500 items are produced.
#2. At 9 a.m a car is 10km directly east of Marytown and is traveling north at 100 km/h. At the same time, a truck leaves Marytown traveling east at 70 km/h. At 10 a.m, how is the distance between the car and the truck changing?
Penny Nom lui répond. |
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Joey had 8 drinking glasses, all of different sizes. |
2005-12-29 |
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Danielle pose la question :
Joey had 8 drinking glasses, all of different sizes. he has lined them up from smallest to largest and numbered them #1 (smallest) to #8 (largest). he knows that glass #4 holds 10 ounces and that glass #7 holds a pint, or 16 ounces. Now he wants to figure out how much all the others hold!
He experiments by filling up different glasses with water and pouring the water back and forth into other glasses. Her are his results:
Penny Nom lui répond. |
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An array of pennies by year |
2005-12-29 |
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Sheila pose la question :
What is an array? How do you create an array using 100 pennies by years?
Penny Nom lui répond. |
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Milliliters to grams |
2005-12-29 |
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Kaitlyn pose la question :
If I'm using baking soda, how do I convert milliliters to grams?
Harley Weston lui répond. |
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One car leaves a spot traveling at 100 km per hour |
2005-12-28 |
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Jason pose la question :
One car leaves a spot traveling at 100 km per hour. The second car leaves the same spot 15 minutes later and traveling at 120 km per hour. How long does it take for the second car to catch up to the first car?
Penny Nom lui répond. |
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Twelve golf balls |
2005-12-28 |
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Todd pose la question :
You have 12 golf balls and 11 of them are the exact same weight, but one of them is either a little heavier or a little lighter. You only have three attempts to weigh the balls. How can you determine which ball weighs more/less than the rest?
Penny Nom lui répond. |
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2800 sq meters |
2005-12-27 |
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Roger pose la question :
I am going to buy some land and its 2800 sq meters. Is it a acre?
Penny lui répond. |
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If an acre of land is covered with one inch of water |
2005-12-27 |
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Patti pose la question :
If an acre of land (43560 sq ft) is covered with one inch of water, how many gallons of water cover that acre.
Penny Nom lui répond. |
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A goat is tied to the corner of a 50 ft square outbuilding |
2005-12-24 |
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Danielle pose la question :
Topic: A goat is tied to the corner of a 50 ft square outbuilding with a 40 ft. rope.
a) What is the measure of the partial circumference created as the goat walks at the full length of the rope?
b) Since the goat is trimming the grass from part of the outbuilding, how much of the perimeter of the outbuilding will the building owner have to trim?
Penny Nom lui répond. |
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Why do we bother learning pre-algebra and algebra 1? |
2005-12-23 |
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Priya pose la question :
My students always ask "Why do we bother learning pre-algebra and algebra 1?" and I haven't found an answer to satisfy them yet. Can you help me? My students are from grade 9 to 11. I have tried giving them real life examples in each topic but it just feels like they are not satisfied!!!
Penny Nom lui répond. |
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Cubic yards of fill |
2005-12-23 |
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Mike pose la question :
And I have a question in regards to the amount of fill needed to bring a vacant lot up to "grade level".
The lot is 112' x 87' and I need to bring in fill to elevate the finished level up 4'.
Penny Nom lui répond. |
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Percentages in our daily life |
2005-12-23 |
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Naina pose la question :
what are the uses of percentages in our daily life
Penny Nom lui répond. |
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Two dogs and a flea |
2005-12-23 |
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Michelle pose la question :
Two dogs, each traveling at 10 ft/sec, run toward each other from 500 feet apart. As they run, a flea flies from the nose of one dog to the nose of the other at 25 ft/sec. The flea flies between the dogs in this manner until it is crush when the dogs collide. How far did the flea fly?
Penny Nom lui répond. |
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Cubic metres to cords |
2005-12-22 |
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Duncan pose la question :
I have a quote of $2.95 per cubic metre of roundwood but I need the conversion equation to convert the above to a $ per cord.
Penny Nom lui répond. |
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Mean and average |
2005-12-22 |
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Jerry pose la question :
This is just a question from a degreed engineer that has a "understanding" problem. please go to http://www.metrika.com/3medical/hemoglobin-m.html
At the end of the page they talk about "mean" vrs "average" there does appear to be a difference. What is it?
Harley Weston lui répond. |
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