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A worm crawling home |
2004-02-18 |
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Cindy pose la question :
A worm is crawling to his home which is one meter away. The longer he crawls the weaker he gets and the less he can crawl the next day. If he crawls within 1/3000 of a meter of his home, he will find food. He must eat within twelve days. The first day he crawls 1/2 meter. The second day he crawls 1/4 meter. The third day he crawls 1/8 of meter. This pattern continues for twelve days. Make a Chart that shows the distance he has covered at the end of each day and the total he has covered at the end of each day. Does he make it to the Food in time?
Penny Nom lui répond. |
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Nonconvex shapes |
2004-02-18 |
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Merrill pose la question :
Draw 4, 6 and 8 sided shapes so that ONE straight line can be drawn through each side
Chris Fisher and Penny Nom lui répond. |
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Acres and square miles |
2004-02-17 |
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Richard pose la question :
How many acres are in .17 square miles? and How many acres are in .6 square miles?
The two areas I am requesting information about are Vatican City and San Marino, the two smallest countries in the world. If I can transfer the sq. miles into acres , I can relate the size of these countries to our school grounds and the students will better understand their sizes.
Penny Nom lui répond. |
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Grams and Milliliters |
2004-02-17 |
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Chantal pose la question :
We have to do a "thing", and I need to convert grams into mililitres (g into mL). how can I do this?
Penny Nom lui répond. |
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Areas, perimeters and derivatives |
2004-02-15 |
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Geoff pose la question :
A recent lecture in my calculus class led me to realize that the derivative of the area of a circle, with respect to the radius is equal to the circumfrence. This also holds true for the relationship between the volume of a sphere and the surface area of that sphere:
why do these hold true? why is it only for circular objects?
Harley Weston lui répond. |
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An arc on a train track |
2004-02-15 |
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A student pose la question :
I'm trying to build a route in a train simulator program. I have a curve to the right (an arc, in other words) with a length of 25 meters and the radius is 1,500 meters. Let's say point P is the beginning of the curve (arc) and point Q is the end point of the arc. Then picture a tangent to point P. I need to find the length of a line perpendicular to that tangent that runs to point Q (the end of the curve/arc).
Penny Nom lui répond. |
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The derivative of x to the x |
2004-02-14 |
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Cher pose la question :
what about the derivative of x to the power x?
Penny Nom lui répond. |
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The substitution method |
2004-02-14 |
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Keisha pose la question :
I need to solve this problem by using the substitution method.
3x+y=1
x=2y+5
Please help me understand the method to solve.
Penny Nom lui répond. |
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Probabilities and olivies |
2004-02-14 |
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Annetta pose la question :
A bowl contains five green olives and eight black ones. Wilma sticks a fork into a bowl and brings out two olives. What is the probability that she gets one green and one black olive?
Harley Weston lui répond. |
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Red riding hood |
2004-02-14 |
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Frank pose la question :
Red riding hood had a number of jars to take to grandma's house. As she traveled she gave away 1/3 of them to an old lady. Then later As she walked through the forest a wolf stole 1/2 of her remaining jars. When she arrived at grandma's house she gave her 2/3 of the remaining jars. She kept 6 jars for herself. How many jars did she start out with.
Diane Hanson lui répond. |
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A pyramid-shaped tank |
2004-02-13 |
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Annette pose la question :
The base of a pyramid-shaped tank is a square with sides of length 9 feet, and the vertex of the pyramid is 12 feet above the base. The tank is filled to a depth of 4 feet, and water is flowing into the tank at a rate of 3 cubic feet per second. Find the rate of change of the depth of water in the tank. (Hint: the volume of a pyramid is V = 1/3 B h , where B is the base area and h is the height of the pyramid.)
Harley Weston lui répond. |
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Fractions |
2004-02-13 |
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A parent pose la question :
12/36=?/18=4/?=?/9
Penny Nom lui répond. |
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Common fractions to decimals |
2004-02-12 |
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A parent pose la question :
I'm trying to help my son work with turning fractions into decimals and this seems foreigh to me after 20 years of not being in school. Can you give me a few illustrations and/or examples of how to do that??
Penny Nom lui répond. |
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Profit |
2004-02-12 |
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Mohamed pose la question :
if i bought some thing with 100$ and the saller told me that his profit was 30% how can i know the actual price of the good
Penny Nom lui répond. |
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Zero |
2004-02-12 |
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Syazwan pose la question :
can you tell me who and when the number zero was
discoveredd
Penny Nom lui répond. |
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