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A Weighty Problem |
1999-06-17 |
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A parent pose la question :
When using a balance scale, weights can be placed on either side of the scale. For example, if a 10 pound weight provides a counter balance to an object and a 7 pound weight, then the object must weigh 3 pounds. What four weights can be used to weigh objects of 1, 2, 3 ... 38, 39, 40 pounds?
Penny Nom lui répond. |
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Even and Odd Function |
1999-06-17 |
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Kent pose la question :
There is one function with the domain of all real numbers that is both even and odd. Please give me the answer to this question before I go insane.
Penny Nom lui répond. |
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Liquid capacity |
1999-06-15 |
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Bernard Antill pose la question :
Would you please tell me how many litres of water in a swimming pool that is 24 feet long, 16 feet wide & 4 feet deep. I would appreciate you showing the formula for this calculation. I am a 74 year old male and I cannot find a formula in which I have any faith! I would also appreciate the answer in Imperial gallons.
Penny Nom lui répond. |
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Slopes of curved lines |
1999-06-09 |
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Stephen Ehrler pose la question :
When one plots the graphs of y=2x, y=3x, y=xx When each of these graphs pass through point (0,1) do they have the same slope? I know they are different lines but is it possable that they have the same slope at point (0,1).
Harley Weston lui répond. |
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Measuring the fourth dimension |
1999-06-07 |
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Suzanne Hall pose la question :
Hi! The other day, two of my students asked a very interesting question: Is the fourth dimension measured with hypercubes? Their reasoning went like this: Lines are 1D and are measured with line segments, which are part of a line. Planes are 2D and are measured with squares, which are part of a plane. Space is 3D and is measured with cubes, which are part of space. So, logically, hypercubes would be used to measure the fourth dimension.
Chris Fisher lui répond. |
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A trig problem |
1999-06-03 |
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Stu Barnes pose la question :
cos(theta) / 1+ sin(theta)=sec(theta)-tan(theta) I've being having trouble with this one on my correspondance course.
Harley Weston lui répond. |
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The three cousins |
1999-06-01 |
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Irena pose la question :
I have three cousins on my dad's side. The product of their ages is 84. Next year the youngest will be 1/4 the age of the middle cousin. In 2 years from now, the oldest will be twice the current age of the middle. What is the age of my oldest cousin?
Harley Weston lui répond. |
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A problem with powers |
1999-06-01 |
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Bill pose la question :
solve for the variable: 5-x = 25x+6
Penny Nom lui répond. |
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How to carpet a room |
1999-05-31 |
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Appleby pose la question :
A room which is 9X12 is to be covered with carpet but the carpet has been provided in one 8X1 piece and one 10X10 piece. The larger piece is to be cut into two pieces so that the room can be covered in carpet.
Stacey Wagner lui répond. |
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An Invalid Argument |
1999-05-31 |
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Rod Redding pose la question :
Can an invalid argument have a true conclusion? If yes then why?
Walter Whiteley lui répond. |
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Graphing a linear equation |
1999-05-27 |
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Dylan Bradley pose la question :
Im in Grade ten and am doing linear equations, I cann't figure out how to make a chart for questions like y = -2x + 3
Penny Nom lui répond. |
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A circle in a square |
1999-05-26 |
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Jose V Peris pose la question :
A circle is inscribed in a square. The circumference of the circle is increasing at a constant rate of 6 inches per second. As the circle expands, the square expands to maintain the condition of tangency. find the rate at which the perimeter of the square is increasing. find the rate of increase in the area enclosed between the circle and the square at the instant when the area of the circle is 25(pi) square inches.
Harley Weston lui répond. |
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Girth |
1999-05-26 |
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Carolyn Bulkley pose la question :
I am trying to explain to my son (who is in the 8th grade) how to figure girth. I'm afraid I have just confused him. Is there a simply formula to figure the girth of a box. for example: I have a box that is 27" L X 22" W X 21" H.
Penny Nom lui répond. |
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Repeating decimals |
1999-05-21 |
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Stan pose la question :
Hi, I am in Honors Math, and have confronted everyone, including teachers, about repeating decimals. What interests me is the number 0.9... and 1. Everyone says that since there is no number between 0.9...(repeating) and 1, that 0.9... = 1. However, isn't a repeating number a representation of a number, and not a real number? Let's look at it this way. 0.9 is close to 1. 0.99 is closer. 0.99999999999999 is even closer. so, 0.9... is a representation of it's closeness to 1. it's an active number... I don't understand how 0.9... is equal to 1. Please help me prove that 0.9... does NOT = 1.
Penny Nom lui répond. |
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Introductory Algebra |
1999-05-19 |
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Pat pose la question :
(2 + sq. root of 3) x (2 - sq. root of 3) = 1 Please show me the work.
Harley Weston lui répond. |
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