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A T.V. is offered at a sale price of £460 |
2007-12-12 |
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From Conor:
I was wondering if you could help me
with this question which I have for homework.
a) A T.V. is offered at a sale price of £460.
If the reduction was 8%, what was the original price of the T.V.?
Answered by Penny Nom. |
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Simplify 63:77 |
2007-12-12 |
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From Selah:
Simplify 63:77
Answered by Penny Nom. |
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Improper fractions and mixed numbers |
2007-12-12 |
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From Selah:
How do I change an improper fraction to a mixed number?
Answered by Penny Nom. |
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sin^2x=1/2(1-cos2x) |
2007-12-12 |
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From katelyne:
Hello there.. I was assigned a problem that I am having trouble with in my
Pre-Calc class and it is as follows:
sin^2x=1/2(1-cos2x)
Answered by Penny Nom. |
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The dimensions of a rectangle |
2007-12-12 |
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From tara:
The length if a rectangle is 5 feet less than twice its width. The perimeter of the rectangle is 38 feet. let w represent the width. write an equation for the perimeter of the rectangle in terms of w. Then solve the equation to find the length and width o the rectangle.
Answered by Penny Nom. |
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How many houses must they paint? |
2007-12-12 |
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From Natalie:
The question is: Four boys work together,painting houses for the summer.For each house they paint they get 256 pounds.
If they work for four months of the summer and their expenses are 152
pounds per a month, how many houses must they paint for each of them
to have one thousand pounds at the end of the summer?
Answered by Penny Nom. |
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Solve sin(x)=x^2-x |
2007-12-11 |
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From ming:
is there anyway you can solve
sin(x)=x^2-x without a calculator?
Answered by Stephen La Rocque. |
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Système à deux équations |
2007-12-11 |
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From Fabrice:
un rectangle a 130 m pour périmetre. si on diminue sa longueur de 1 m et on augmente sa largeur de 1 m, l'aire augmentera de 14m².
trouver les deux dimentions du rectangle. (on trouvera, au préalable, la difference des deux dimensions)
Answered by Claude Tardif. |
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Find the perimeter of the original rectangle. |
2007-12-11 |
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From Hannah:
The area of a rectangle is 360 square meters. If the rectangle's length is increased by 10 meters and the width is decreased by 6 meters, its area does not change. Find the perimeter of the original rectangle.
Answered by Melanie Tyrer. |
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Pictographs |
2007-12-11 |
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From eniyah:
The title of my pictograph is Favorite pets. I have two columns. in my first column is the kind of pet and the second column is the numbers of students, the dogs have 16 student that like them and cats have ten students the likes them. each pictures equals 2 stodents my question is. i have to draw paictures to show the number of students for each row. the key says each symbol equals 2 students. since 16 divided by 2 is 8 can you show me how to make this in a graph
Answered by Stephen La Rocque. |
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Shooting an arrow over a wall |
2007-12-11 |
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From Amy:
The path of a large arrow fired from a non
torsion catapult can be modeled by y=-0.0044x^2 + 1.68x, where x is the distance the
arrow travelled (in yards) and y is the height of the arrow (in yards). Given the height of
a castle wall, find the safest distance from the wall to launch an arrow over a 120 yard-high wall.
Answered by Victoria West and Stephen La Rocque. |
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The tangent to a curve |
2007-12-10 |
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From Christy:
I know this question is simple but I can't figure out what I'm doing wrong.
Find the equation of the tangent line to the curve 2x^2 - y^4= 1 at the point (1,1).
Answered by Penny Nom. |
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Mean and standard deviation |
2007-12-10 |
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From Jamie:
Let n be any odd whole number.
a) Which has the greater mean: the odd whole numbers from 1 to n, or the even whole numbers from 2 to n-1?
b) Which has the greater standard deviation: the odd whole numbers from 1 to n, or the even whole numbers from 2 to n-1?
Answered by Penny Nom. |
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A math trick |
2007-12-10 |
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From Megan:
I need to write a mathematical explanation of why this works!
Start with a four digit number. (a positive integer, and all digits can NOT be the same. At least one must be different)
Rearrange that four digit number.
Subtract the smaller 4-digit number from the larger.
Now circel one digit. (canNOT be zero, because that is already a circle)
Now re-write that number excluding the circled digit.
Compute the sum of the digits.
Now write down the next multiple of 9 that is larger than the sum.
Subtract the Sum from the multiple. (multiple - sum of digits)
Report Difference = to number circled.
The resulting number should be the number that originally circled.
Answered by Penny Nom. |
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Animals for sale |
2007-12-09 |
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From Marion:
This question has come up and I know the answer and the equation, but how do you solve this?
Please share the proof. cows=$10, pigs=$3, chickens=$.50
In any combination buy 100 animals with $100.
Answered by Leeanne Boehm. |
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