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Two quadratic equations |
2012-11-22 |
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From fahmie:
graph and solve the intersection of the following equations:
x^2+y^2=4
x^2+2y=4
Answered by Penny Nom. |
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A raised bed in the shape of an octagon |
2012-11-22 |
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From pat:
I want to make raised-bed gardens - usually 4' square, but want to be more creative by creating octagonal boxes. The ideal size for square beds is 4'x4'. The boards are 8' long, so I want to get as much out of a board as I can. If I want an octagon with a diameter of 4', I think the sides would be (rounded off) about 1.5' each using 2 full boards with a little waste and the growing space would be less than a 4' square (16 square feet). If I want to increase the length of each side to 2' each (getting the max from a board), what will the diameter of this octagon be so I can determine the growing space of the box. (The reason a 4' square is important in gardening, besides maximizing the wood, is that a person can reach into the center to plant and pick veggies without stepping on the soil, so diameter is important). My math days are long over and I'm having trouble working with octagons! Thank you!
Answered by Harley Weston. |
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Golf for 2 groups of 4 for six rounds |
2012-11-21 |
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From Andy:
You have very kindly responded to a couple of questions I asked previously and I have tried to find the answer to my current query on the various links etc. My question: There are 8 of us going on a Golf Tour and we will be playing 2 groups of 4 for six rounds of golf. Is there a suitable schedule that works to ensure everyone plays with each other the same number of times (or as close as possible). Many thanks again for your help.
Answered by Victoria West. |
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Difference of squares |
2012-11-19 |
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From Qelibar:
Please factorise x^2y^2 - 4
Answered by Penny Nom. |
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A function problem |
2012-11-18 |
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From nahla:
f: IN --> IN
n --> f(n)
for every n that belongs the IN : fof(x) = 4n - 3
and for every n that belongs to IN f(2^n) = 2^(n+1) -1
Calculate f(993)
Answered by Penny Nom. |
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The square of any odd number, decreased by 1, is divisible by 8 |
2012-11-16 |
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From bailey:
Prove that the square of any odd number, decreased by 1, is divisible by 8
Answered by Penny Nom. |
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A path around a pond |
2012-11-16 |
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From bailey:
hi there,
A circular pond is surrounded by a path 1 metre wide.
The area of the path is 1/4 of the area of the pond.
Find the radius of the pond.
Thanks
Answered by Penny Nom. |
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Factor (6a^2-5a+1)(8a^2-6a+1)(12a^2-7a+1) |
2012-11-16 |
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From bailey:
Factorise f(a)=(6a^2-5a+1)(8a^2-6a+1)(12a^2-7a+1)
thus find [f(a)]^1/2
Answered by Penny Nom. |
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Stairs for the new community center, part 2 |
2012-11-13 |
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From Emily:
Plans for a set of stairs for the front of a new community center use the ratio of rise to run of 2 units to 5 units.
B. Sketch a set of stairs that meets the rise-to-run ratio of 2 units to 5 units.
Answered by Penny Nom. |
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How much should I price the earrings? |
2012-11-13 |
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From Sharon:
I want to sell some earrings and make a $12.00 profit on them I have to pay a
35% commission on them. How much should I price the earrings?
Answered by Penny Nom. |
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-5<2x+1<-1 |
2012-11-11 |
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From Rahul:
How does -5<2x+1<-1 changes to 1<|2x+1|<5. What is the rule?
Can we apply absolute value function throughout the first inequality i.e. can we say |-5|<|2x+1|<|-1|. But then it becomes 5<|2x+1|<1 which is impossible because 5 is not less than 1.
Answered by Penny Nom. |
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What's your secret? |
2012-11-11 |
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From ryan:
Tuscan school has a fair. At the fair, Pia plays "what's your secret?
The game starts with 3 players who are told the same secret.
Each of those 3 players tells another 3 player, and so on.
At the end of the 3rd round, everyone who knows the secret
will compare what they have heard. What number in exponent form
represents the number of people who know the secret after 3 rounds?
How many people is that?
Thank you very much.
P.S. I got 3 cube. which is 27
But when i map it out I end up with 39.
Answered by Penny Nom. |
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Practical uses of trigonometry |
2012-11-11 |
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From Michael:
Where can I find books or information on real life function of sine and cosine?
Answered by Penny Nom. |
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A mathematical expression with the answer 7 |
2012-11-10 |
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From emily:
hey um i need to find and problem that fallows bedmas that has one division one multiplication and one sub and one add and one brackets and one exponents that has the answer of number 7
Answered by Penny Nom. |
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Converting a mixed number to a decimal |
2012-11-10 |
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From Mahaveer:
Convert mixed fraction to decimals: 4 2/6
Answered by Penny Nom. |
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