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A truncated, square-based pyramid |
2014-11-23 |
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From Hannah:
A designer vase has the shape of a truncated, square-based pyramid. The base of the vase is a square with a side length of 15 cm. The area of the square opening is 70.56 cm2. Each of the four sides is a trapezium with slant sides 9 cm long. Find (to the nearest square centimetre) the total surface
area of the vase.
Answered by Penny Nom. |
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Doubling the dimensions of a cone |
2014-11-21 |
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From Hannah:
If the volume of a cone of height 10 cm is 261.8 cm3, show that this
volume is increased by a factor of 8 if the dimensions of the cone are doubled.
Answered by Penny Nom. |
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Two quadratic equations |
2014-11-20 |
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From rajesh:
Sir,
I would like to discuss on question-
-Find the value of variable X and Y, equations are
X2+Y2+2XY=25
X2+Y2-2XY=1
Sir, my point is equation looks not so easy.My opinion is there many
(more than 4)value possible for both X and Y.
Kindly help me.
Waiting for your response.
regards,
rajesh
Answered by Penny Nom. |
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Factorise 15x + 15y |
2014-11-20 |
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From Jordan:
hi i saw a question in class today that i didn't understand and i didn't really understand what my teacher was going on about so how do you factorise 15x + 15y
Answered by Robert Dawson and Penny Nom. |
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An arithmetic progression |
2014-11-19 |
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From Gbenga:
In an A.P the difference between 8th and 4th term is 20. The 8th term is 1\2 times the 4th term . Find arithmetic progression..
Answered by Penny Nom. |
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Two ships |
2014-11-18 |
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From Laura:
7. A ship leaves its home port and sails on a bearing of N28.17°E. Another ship leaves the same port at the same time and sails on a bearing of S61.83E. If the first ship sails at 24 mph and the second at 28 mph find the distance between the two ships after 4 hours.
Answered by Robert Dawson. |
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An age related word problem |
2014-11-18 |
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From Cole:
Susan and Russell are brother and sister. Susan says that in two years she will be twice Russell's current age. Russell says that he's only three years younger than Susan. How old is each of the siblings?
Answered by Penny Nom. |
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How many square feet in 10 gallons of liquid at 1/4 in thick? |
2014-11-14 |
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From Rich:
How many square feet in 10 gallons of liquid at 1/4 in thick
Answered by Penny Nom. |
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(x-3)^2-(x+3)^2 |
2014-11-13 |
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From Bernice:
(x-3)^2-(x+3)^2
Answered by Penny Nom. |
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1/6k=-11 |
2014-11-13 |
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From Marty:
Using the balance method, what is the answer to 1/6k=-11, trying to find what k equals. Thanks
Answered by Penny Nom. |
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An irregular convex octagon |
2014-11-13 |
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From james:
I have an irregular convex octagon, alternating between 4 large edges, say 'a' mm long and 4 small edges, say 'b' mm long, is there a formula available so that I can work out the minimum size sit a circle with a radius of 34.25mm inside it thank you
Answered by Chris Fisher. |
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The cube root of 729 |
2014-11-12 |
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From Alexis:
What would be the square root of 729 to the third power and could you
explain how to get the answer?
Answered by Penny Nom. |
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What is -3 squared? |
2014-11-12 |
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From Christine:
On a math test, it said "What is -3 squared?" It did NOT say "What's is (-3)squared"
The teacher's explanation is that if there are no brackets or parenthesis, you ALWAYS square the number first then do the negative, so the answer should be -9, but I can't find anywhere that confirms this.
Help please.
Answered by Robert Dawson. |
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Some geometry problems |
2014-11-07 |
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From Maria:
Hi there,
My name is Maria and I'm a student in Ireland.
Can you pleeeease help me with questions 1 to 4 on the attached file. I'm really stuck:
Answered by Penny Nom. |
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The area of a pentagon |
2014-11-04 |
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From Gracie:
i really need help with this problem in my math book, will you help?
"Derrick drew regular pentagon with side lengths of 8 centimeters.
He divided the pentagon into 5 identical triangles, and measured the
height of one of the triangles to be 5.5 centimeters. Find the area of
the pentagon."
this really makes no sense to me. Can you help me with anything
to make it easier?
THANKS!!!!!
Answered by Penny Nom. |
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