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A frustum |
2013-10-12 |
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From Lily:
A cone of height 6in. and radius of base 4in. has its top cut off by a plane parallel to its base and 4in from it.
Find the volume of the remaining frustum.
I have worked out the volume of the entire cone but I don't know how to work out the radius of the top of the frustum.
Thanks
Answered by Penny Nom. |
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The domain of a derivative |
2013-10-10 |
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From Renee:
I am looking to find the domain of a derivative of a radical function,
one such as: f(x) = the square root of (8 − x).
I am kind of unclear on how domains work for derivative.
I don't understand how you take a function's domain and use that to
find the derivative's domain.
Thanks!
Answered by Penny Nom. |
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Proportional rates |
2013-10-10 |
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From Varsha:
A province's Ministry of Social services has found that both the number of people needing social assistance and the province's total expenditures on social assistance are proportional to the rate of unemployment. Last August when the provincial unemployment rate was 8.4 %, the province provided assistance to 89,300 individuals at a total cost of 4107.4 million. The forecast unemployment rate for next August is 7.9%. How many people can the province expect to need social assistance next August? What amount should the province budget for social assistance in August?
Answered by Penny Nom. |
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How many cubic centimetres are there is a cubic meter? |
2013-10-10 |
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From Larry:
Change 1meter(to 3rd power) to centimetre(to 3rd power).
This is a metric conversion problem
Answered by Penny Nom. |
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Markup |
2013-10-10 |
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From toya:
The cost for an item is $27.99. If the selling price is $39.99, then detetmine the following markup, %markup on cost, %markup on selling price
Answered by Penny Nom. |
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Four tangent circles |
2013-10-09 |
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From Nilesh:
Four circular cardboard pieces, each of radius 7cm are placed in such a way that each piece touches two other pieces. How to find the area of the space enclosed by the four pieces?
Please let me know.
Answered by Robert Dawson. |
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Maximize the volume of a cone |
2013-10-09 |
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From Conlan:
Hi I am dong calculus at school and I'm stumped by this question:
A cone has a slant length of 30cm. Calculate the height, h, of the cone
if the volume is to be a maximum.
If anyone can help me it would be greatly appreciated.
thanks.
Answered by Penny Nom. |
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An Arithmetic Progression |
2013-10-08 |
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From collins:
In an A.P. the difference between the 8th and 4th term is 20 and the 8th is one and half times the 4th term... what is the common difference and the first term
Answered by Penny Nom. |
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A line through (5, 1) |
2013-10-08 |
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From allison:
find an equation in standard form for line passing through point (5,1) and perpendicular to line x=4
Answered by Penny Nom. |
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The ratio of salt to water |
2013-10-06 |
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From varsha:
My name is Varsha. I am a student and below is my question:
1. The brine used in an industrial process is 12.5% salt by weight. What i=
s the ratio (by weights) of salt to water to the brine?
Thank you
Varsha
Answered by Penny Nom. |
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Two bikers race on a circular track |
2013-10-03 |
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From bryan:
two bikers race on a circular track. biker a can circle the track in 8 minutes, and biker b can circle the track in 6 minutes. From the start of the race, how many minutes will it be before biker b overtakes biker a.
Answered by Chris Fisher. |
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A triangle problem |
2013-10-02 |
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From raneem:
ABC is a triangle in which : BC=20cm. M(<B) =29 and m(<C)=73 . D is the midpoint of BC
Find the length Of AB and AD approximated to 2 decimal places
Answered by Penny Nom. |
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Problem solving |
2013-10-02 |
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From naomi:
My son having trouble a math problem please help with this question a bag of cough drops contains 36 drops. the fraction of each flavor is shown in the table strawberry 5/12 honey 1/12 cherry 1/6 mint1/9 and lemon 1/4 which flavor is the greast in the bag
Answered by Penny Nom. |
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Group the addends so that you can add mentally |
2013-10-01 |
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From monica:
the questions in the homework says change the order or group the addends so that you can add mentally ,find the sum and tell which property you used
120+37+280 and 25+25+30
Answered by Penny Nom. |
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Base 5 |
2013-09-30 |
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From Zakir:
Sir I wanna know something about base 5 number system
Why we use it and who use this ? and what is the purpose of it
Answered by Robert Dawson. |
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