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$6.25 in nickels quaters and dimes |
2009-10-10 |
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From miriam:
a piggy bank contains $ 6.25 in nickles quaters and dimes.
there are 65 coins all together and there are four times as many nickles as quaters
find the number of coins of each kind
Answered by Penny Nom. |
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Find the intersection of y=x-1 and y=sin(x) |
2009-10-10 |
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From Usama:
There are many modern calculators and softwares that can plot the functions.
I have two very simple equations y=x-1 and y=sin(x), if i draw them manually on paper i can not get the accurate value.
But i think a computer can easily draw perfect straight and curve lines so it should be easy to find the intersection point of two lines.
Is there any way or software that can tell the exact value of intersection point of two lines?
Answered by Robert Dawson and Harley Weston. |
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Golf for 8 |
2009-10-10 |
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From Chris:
I have a group of 8 golfers who will be playing three rounds,
What is the best formula so we can all try to play with different people
during the 3 rounds .
Answered by Victoria West. |
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24 feet of pipe in 3 pieces |
2009-10-09 |
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From Sam:
I had a carpenter being a smarty pants with me. Question: I have a 20ft piece of pipe. I need three equal lengths cut. What is the measurement of each cut? He told me the answer right away because he knows the measuring tape like the back of his hand. The answer is 6'8". Is there an equation I can use to get the answer quicker than him looking at his tape measure?
Answered by Penny Nom. |
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Two rectangles |
2009-10-08 |
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From Lillian:
A rectangle is 5cm longer than twice its width.
The width of another rectangle is 3cm less
than the width of the first rectangle and its length is 6cm more than 3 times its
width. If the perimeters are equal, find the dimensions of both rectangles
Answered by Penny Nom. |
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Un triangle isocèle |
2009-10-08 |
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From lauwick:
ABC un triangle isocèle en A de périmètre 16 cm. De plus son aire
est égale au quart de l'aire du carré construit sur sa base bc.
Quelles sont les longueurs des cotés de ce trangle?
Merci
Answered by Claude Tardif. |
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Elimination method |
2009-10-08 |
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From Kenty:
How do I solve this problem using the elimination method?
3x-7y=0
6x+4y=0
I am not sure how so if someone can show me a similar problem (instead of
solving this one for me) that would be fantastic.
Answered by Penny Nom. |
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A number between 48 and 59 |
2009-10-07 |
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From nakia:
I am a number less 59 but greater than 48. my ones digit is 2 more than my tens digit.What's the number?
Answered by Penny Nom. |
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Polyèdres |
2009-10-07 |
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From DEPASSE:
Si un polyèdre est inscriptible et circonscriptible, et si ses
faces sont isométriques(non nécessairement polygones réguliers) , le dièdre entre deux quelconques de ses faces adjacentes est il toujours le même ? Si non, un exemple?
Answered by Claude Tardif. |
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Two jets are traveling towards each other |
2009-10-05 |
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From jake:
two jets are traveling towards each other and are 4000 km apart. the rate of one jet is 100 km/h faster than the rate of the other. if the jets pass each other after 2.5 hrs what is the rate of speed of the faster jet?
Answered by Penny Nom. |
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The maximum number of right angles in a polygon |
2009-10-05 |
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From Bruce:
Is there way other than by trial and error drawing to determine the maximum number of right angles in a polygon? Secondary question would be maximum number of right angles in a CONVEX polygon. Is there a mathematical way to look at this for both convex and concave polygons? Or are we limited to trial and error drawing?
Answered by Chris Fisher. |
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A periscope |
2009-10-05 |
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From likhitha:
In a periscope, MIRRORS ARE PLACED PARALLELLY.Then why they do not form multiple images
Answered by Robert Dawson and Chris Fisher. |
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What is the next term? |
2009-10-04 |
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From julia:
patterns
18 46 94 63 52 61 what is the next one?
Answered by Penny Nom. |
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How high is the ledge? |
2009-10-03 |
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From gabby:
Standing on a ledge, there is a boat 25 degrees below you. The boat has a 1,000ft. tower. If the angle of elevation to the top of the tower is 15 degrees, how high is the ledge?
Answered by Stephen La Rocque. |
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A parabolic bridge |
2009-10-03 |
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From SANDRA:
a bridge is constructed across the river that is 200 feet wide. the arch is parabolic
so that the focus is on the water. A sheep 50 ft wide and 30 ft high passes safely
through the arch
a) find equation of the arch
*y-k=(-1/4)(x-h)^2
b) find the highest point of the arch
Answered by Stephen La Rocque. |
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