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Five digit numbers |
2006-03-25 |
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From Tony:
Can someone tell me how many unique five digit numbers can be generated using 0-9?
Answered by Stephen La Rocque and Penny Nom. |
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Comparing Fractions |
2006-03-24 |
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From J.:
how can you compare fractions with like numerators and UNlike denominators, like 2/3 and 2/5, without renaming or using fraction strips?
Answered by Stephen La Rocque and Penny Nom. |
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A 25 foot ladder is leaning against a building. |
2006-03-24 |
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From Ali:
A 25 foot ladder is leaning against a building. The base of the ladder is 7 feet from the building. How high up the building does the ladder reach?
Answered by Stephen La Rocque. |
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given that p is a prime and p|a^n, prove that p^n|a^n |
2006-03-24 |
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From Janna:
given that p is a prime and p|an, prove that pn|an
Answered by Stephen La Rocque. |
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Worker A can do a piece of work in 15 days,... |
2006-03-23 |
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From Kenneth:
Worker A can do a piece of work in 15 days, worker B in 12 days, and worker C in 10 days. Worker A works 2 days, worker B 3 days, and worker C 3 days. In what time can worker A and worker B finish the job by working together?
Answered by Penny Nom. |
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A number puzzle |
2006-03-22 |
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From A teacher:
Students brought this website to my attention and asked why this puzzle worked... I'm not sure. The url is: http://digicc.com/fido/ and it tells you to choose a 3 or 4 digit random number with different digits. Write it down, rearrange, subtract the smaller from the larger. then circle a nonzero digit, type the remaining digits into the space provided and they will tell you the number you circled. Can you provide the reason that this works.
Answered by Claude Tardif and Penny Nom. |
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x+6/7 = 3/5 |
2006-03-22 |
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From Cavell:
i couldn't find in the book on how to solve
x+6/7 = 3/5
i know its simple but i don't remember how and the book never explains step by set on how to solve problems and i don't have a teacher to ask because i do work through mail so i cant ask questions vary easily
Answered by Stephen La Rocque. |
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Piecewise functions |
2006-03-21 |
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From Kris:
First Problem:
Southeast Electric charges .09 cents per kilowatt-hour for the first 200 kWh.The company charges .11 cents per kilowatt-hour for all electrical usage in excess of 200 kWh. How many kilowatt-hours were used if a monthly electric bill was $57.06? The answer I came up with is 360, is that right? and also how do I set it up in an equation form?
Second Problem:
A construction worker earned $17 per hour for the first 40 hr of work and $25.50 per hour for work in excess of 40 hr. One week she earned $896.75. How much overtime did she work? I came up with 8.5 hrs over-time worked. Again I don't know how to set up the equation to come up with the answer.
I need some pointers on how to figure out story problems! If you have any suggestions that would help me out I would be very grateful.
Answered by Penny Nom. |
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The volume of water in a cone |
2006-03-21 |
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From Ghulam:
A vessel has the shape of an inverted cone.The radius of the top is 8 cm and the height is 20 cm. Water is poured in to a height of x cm.Show that if the volume of the water is V cubic cm,then V=(4/75)pi x3.
Answered by Penny Nom. |
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How far from Earth is Neptune? |
2006-03-21 |
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From Scott:
A laser beam travelling at the speed of light bounces off the planet Neptune and returns to Earth in 29 960.72 s. The speed of light is 299 792.5 km/s. How far from Earth is Neptune?
Answered by Penny. |
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Cubic yards of concrete |
2006-03-21 |
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From Shane:
I need to know how many cubic yards of concrete is needed for a 4" thick driveway and 18' wide and 27' long. What formula do I need to use?
Answered by Penny. |
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BEDMAS |
2006-03-21 |
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From Andie:
It's been a long time since I've used bedmas. I'm still confused as to what the answer to this question would be.
30 - (2 x 9) + (15/3)=
Answered by Penny Nom. |
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The waterway between Lake Huron and Lake Superior |
2006-03-21 |
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From Trenae:
the waterway between lake huron and lake superior separates the u.s and canada.it is usually 13 feet above the water when its closed and each section is 210 feet long if the angle of elevation is 70 degrees then what is the distance from the top of the drawbridge to the water and the width of the gap created by the 2 sections of the bridge
Answered by Penny Nom. |
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Three towns are located at the vertices of an equilateral triangle |
2006-03-20 |
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From A student:
three towns are located at the vertices of an equilateral triangle. The towns are 8, 5, and 3 miles, respectively, from a store. How far apart are the towns?
Answered by Chris Fisher. |
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A manufacturer of cotton pins |
2006-03-20 |
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From Nirmal:
A manufacturer of cotton pins knows that 5% of his products are defective. If he sells cotton pins in boxes of 100 and guarantees that not more than 10 pins will be defective, what is the approximate probability that a box will have the guaranteed quantity?
Answered by Penny Nom. |
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