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A gravel pile in my driveway |
2009-05-13 |
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From Dean:
The only place I have to deliver gravel is in my driveway. The driveway is 16 ft wide by 18 ft long. How much gravel can I order as to not exceed the boundaries of my driveway when the truck dumps the gravel onto my driveway?
I am assuming the angle of repose comes into play when calculating this elliptical pile? The maximum amount of gravel I need is 12 cubic yards.
Answered by Robert Dawson. |
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A reward and a fine |
2009-05-12 |
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From garth:
A maths teacher promised a learner that she would pay him R8 for each problem solved correctly,
but she would fine him R5 every incorrect solution.
At the end of 26 problems neither owed any money to the other.
How many problems did the learner solve correctly?
Answered by Robert Dawson and Penny Nom. |
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Finding an Array to an Integer Linear Programming Problem |
2009-05-12 |
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From Debbie:
how to make an array for 3 box of juice for 25 students and 2 teacher. 1 pack of juices
hols 3boxes the answer is 9 packages but how do you make array for this
Answered by Janice Cotcher. |
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The volume of an egg |
2009-05-12 |
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From Dylan:
What formula do you use to calculate the volume of an egg?
Answered by Stephen La Rocque and Penny Nom. |
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16 teams, 15 weeks, would like to pair up with no repeats. |
2009-05-12 |
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From Kimberly:
16 teams, 15 weeks, would like to pair up with no repeats. Thank you so very much.
Answered by Robert Dawson. |
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Solve -1<5-2x<10 for x |
2009-05-12 |
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From Helen:
solve the following inequality for x
-1<5-2x<10 Te less then sign by the one, should be less then or equal to.
Answered by Stephen La Rocque and Penny Nom. |
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differentiate y sin[x^2]=x sin[y^2] |
2009-05-11 |
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From mamiriri:
derivate y sin[x^2]=x sin[y^2]
Answered by Harley Weston. |
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7 digit combinations |
2009-05-11 |
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From CAROL:
I NEED TO KNOW HOW MANY 7 DIGIT COMBINATIONS FROM 0-9 THERE ARE WITHOUT ANY REPEATES,
OR WHAT THOSE COMBINATIONS ARE?
Answered by Penny Nom. |
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Maximum profit |
2009-05-11 |
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From Sally:
a manufacturer of dresses charges $90 per dress up to 100 units and the average production cost is $60 per dress. to encourage larger orders the company will drop the price per dress by .10 for orders in excess of 100. I need to find the largest order the company should allow with the special discount to realize maximum profit.
Answered by Harley Weston. |
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A six sided pyramid |
2009-05-11 |
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From Karen:
I am going to make my kids a six sided tipi (pyramid) I have a 5 foot tall central pole, and I would like the floor area to be 6 feet across. How do I work out what size to cut each fabric panel to make this happen?
Answered by Harley Weston. |
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The hypotenuse of a right angled triangle |
2009-05-11 |
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From Deb:
Find the length of the hypotenuse of a right angled triangle with one leg 7 cm longer than the other and the hypotenuse 2 cm longer than the longer leg. I've ended up with the hypotenuse = x+9, another side = x and the other side = x+7. what do i do next?
Answered by Penny Nom. |
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Unit Conversion for Force and Mass |
2009-05-08 |
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From Ray:
Good Day! I was confused about lbm and lbf and slug. I knew that lbm is a unit
for mass and lbf is a unit for weight. my problem is some books follow this
relationship where lbf=(lbm times the gravitational pull) which is 32.2 ft/(s^2)
while other books treat lbm=lbf. other books also treat lbm=(lbf times 32.2)...
which is correct?
Is 1kg=2.205 lbm or 1kg=2.205lbf?
Is 1BTU=778.16 lbf-ft or 1BTU=778.16 lbm-ft?
what is the relationship of slug on these two, lbm and lbf?
Answered by Janice Cotcher. |
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Cubic feet and cubic yards |
2009-05-08 |
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From TJ:
21 bags at 2 cubic feet per bag.
How many yards would that be?
Answered by Penny Nom. |
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Six teams, two sites, and four days |
2009-05-08 |
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From John:
I have six teams, two sites, and four days. We have decided that we want to have tri-meets, where there would be three teams competing against each other at the same site each day. Here is the problem, I need to make sure that each team sees each other team at least once and each team goes to each site at least once.
Answered by Victoria West. |
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A number sequence |
2009-05-08 |
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From alicia:
what is the next number 1,2,6,42,1806------? is it 1954?
Answered by Robert Dawson, Chris Fisher, Penny Nom and Claude Tardif. |
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