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How many color combinations are possible for the four rooms. |
2009-01-26 |
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From Irfan:
John wants to paint 4 rooms in his house, each a different color and he may choose from 7 different colors of paint.
How many color combination are possible for the four rooms.
Answered by Robert Dawson. |
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A regular hexagon is inscribed in a circle. |
2009-01-26 |
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From Thejas:
A regular hexagon is inscribed in a circle. If the perimeter of the hexagon is 42 inches, how many inches are in the circumference of the circle?
How do you express this in the terms of pi?
Answered by Robert Dawson and Penny Nom. |
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How many students were there |
2009-01-25 |
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From sooos:
After a math lecture in university, the students go to the cafeteria. EACH ONE of them buys a cheese sandwich and a cup of tea. They ALL pay $18.49. How many students were they?
Answered by Chris Fisher. |
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A cubical tank that is 8 m on a side |
2009-01-25 |
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From gina:
Suppose one edge of a cubic tank is 8m; Find the volume of the tank in cubic meters
Answered by Penny Nom. |
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The area of a triangle |
2009-01-25 |
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From black:
Explain how the formula for the area of a triangle can be determined by using the formula for the area of a parallelogram.
Answered by Penny Nom. |
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An octagonal carpet |
2009-01-24 |
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From Larry:
I am cutting a piece of carpet that is 9 feet x 9 feet and need to cut it into an octagon. How far do I cut from the corner of the square. thank you for any help.
Answered by Harley Weston. |
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How fast is the visible surface of the earth decreasing? |
2009-01-24 |
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From Ray:
A dive bomber loss altitude at a rate of 400 mph. How fast is the visible surface of the earth decreasing when the bomber is one mile high?
Answered by Harley Weston. |
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Perimeters and scale factors |
2009-01-24 |
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From dennis:
I have this work that says how are the value of the ratios for the perimeters related to the scale factor? PLEASE HELP ME OUT
Answered by Harley Weston. |
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An integral from 1 to infinity |
2009-01-24 |
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From Ray:
Determine the area bounded by the x-axis and the curve y=1/(x^2) from x=1 to x=infinity.
A. 1.00
B. infinity
C. indeterminate
D. 2.00
Answered by Harley Weston. |
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20 of us golf together in groups of 4 |
2009-01-24 |
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From D.:
Every Sunday, 20 of us golf together in groups of 4. I am looking for a
way that each of us play with 3 other people each week and ultimately get
to play in groups that are unique. For instance if week 1, I play with 2, 3, 4
and then the next week I play with 5, 6, 7, and the 3rd week I play with 8,
9, 10 and so forth until I have played with everyone. Everbody else should be
doing the same thing. Can you give me a schedule for this and how many weeks
would it take for all of us to accomplish this where we all play with different
combinations of people. (We should not play with the same person very often or even
the same pairs of people but everyone should play with everybody else) I hope
this makes sense........whew and thanks!
Answered by Victoria West. |
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Water flowing from a cone to a cylinder |
2009-01-23 |
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From Ray:
Water is passing through a conical filter 24 cm deep and 16 cm across the top into a cylindrical container of radius 6 cm. At what rate is the level of water in the cylinder rising when the depth of the water in the filter is 12 cm its level and is falling at the rate of 1 cm/min?
Answered by Harley Weston. |
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Two tangent circles |
2009-01-23 |
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From Murtaza:
Two circles touch externally at T. A chord of the first circle XY is produced and touches the other at Z. The chord ZT of the second circle, when produced, cuts the first circle at W. Prove that angle XTW = angle YTZ.
Answered by Robert Dawson and Chris Fisher. |
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A cyclic quadrilateral |
2009-01-23 |
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From Murtaza:
Line ATB touches a circle at T and TC is a diameter. AC and BC cut the circle at D and E respectively.Prove that the quadrilateral ADEB is cyclic.
Answered by Robert Dawson and Chris Fisher. |
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Sheep, goats, and hogs |
2009-01-23 |
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From La:
A man buys sheep, goats, and hogs, to the number of 100, for 100 crowns; the sheep cost him 1/2 a crown a-piece; the goats cost him 1-1/3 crowns a-piece; and the hogs cost him 3-1/2 crowns a-piece. How many had he of each?
Answered by Robert Dawson. |
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The tens digit of 0! + 1! + 2! + 3! + 4! .............+9999! + 10000! |
2009-01-23 |
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From Kaylyn:
determine the tens digit for the expression:
0! + 1! + 2! + 3! + 4! .............+9999! + 10000!
Answered by Robert Dawson and Penny Nom. |
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