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Bricks around a fire pit |
2015-03-05 |
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From Jayson:
I have a round fire pit. It measures 25 inches in diameter. I have 12 inch long square bricks to go around it . My question is what degree do I cut the ends of these bricks to make them fit around this circle? The brick dimensions are 12"Lx6"Wx4"D.
Answered by Harley Weston. |
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Istanbul to Lagos |
2015-03-03 |
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From Victor:
A plane flies from Istanbul to Lagos at 800km/h and then returns to Istanbul at 900km/h. The return trip takes 1 hour less than the flight to Lagos. What is the distance between Istanbul and Lagos?
Answered by Penny Nom. |
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Two consecutive positive integers |
2015-03-01 |
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From meha:
Find two consecutive positive integers , sum of whose squares is 365.
Answered by Penny Nom. |
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Solve x=r(t-sin(t)) for t |
2015-02-28 |
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From David:
I don't know how to write the function of t(x) by x=r(t-sin(t)).
Can you teach me that?
Answered by Harley Weston. |
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The radius of a cylinder |
2015-02-26 |
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From Rose:
Hi. I want to know how to find the radius of cylinder.
When I have height (35cm) and area of the curved surface(880sq.cm).
I know the formula is 2πr(h+r). But I can't understand how to find it's radius.
Please help me. I really need your help.
Answered by Penny Nom. |
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Two equations with fractions |
2015-02-26 |
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From Pulane:
Hi math centre I've been trying to solve these equations for days now please help
(6/x)-(1/y)=4
(9/x)+1=(-2/y)
Please help me solve them simultaneously
Thank you
Answered by Penny Nom. |
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A question in set theory |
2015-02-25 |
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From Jared:
If a set A={1,2,3} and set B={ {}, 1}
Can B be a subset of A? Since every Set contains an {} ?
Answered by Robert Dawson and Claude Tardif. |
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Two concentric circles |
2015-02-25 |
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From Manasi:
The area between 2 concentric circles is 6 times the smaller circle. Radius of small circle is 7 cm. Find the difference in the circumference of the bigger circle ad the smaller circle?
Answered by Penny Nom. |
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3 over "x" plus 5 |
2015-02-23 |
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From Kenny:
3 over "x" plus 5. I don't know this is either a polynomial and if so how would you define it.
Answered by Harley Weston. |
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f(x)=(x^2-1)/(x-1) |
2015-02-21 |
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From Ahmed:
Is f(x)=[(x^2-1)/(x-1) and x=2 at x=1] differentiable at x=1 ? Why ?
Answered by Penny Nom. |
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A region described by inequalities in cylindrical coordinates |
2015-02-21 |
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From Rahul:
I am not able to visualize a solid given by inequalities as under (in cylindrical coordinate system)
0=
I know that (can visualize) first 2 inequalities say it is a cylinder of infinite length.
It seems that third inequality poses the restriction to the height as well as it makes us to remove a cone.
But I just can not understand it clearly.
Thanks in advance!
Regards,
Rahul
Answered by Penny Nom. |
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Column vectors |
2015-02-21 |
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From jill:
A has co- ordinates (7,-1) and B has co-ordinates (3,5).write these as column vectors
Answered by Penny Nom. |
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A limit |
2015-02-19 |
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From genc:
Lim (27x^3-1) / (3x-1)
X-> 1/3
Answered by Harley Weston. |
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The height of a building |
2015-02-18 |
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From prateek:
the height of a flagpole on top of a building is 6m.
the angle of elevation of the top and bottom of the flagpole are 45 and 30 respectively.
find the height of the building
Answered by Penny Nom. |
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An isosceles triangle and an arc |
2015-02-18 |
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From Sreeharsha:
The diagram shows an isosceles triangle ABC in which BC = AC = 20 cm, and angle BAC = 0.7
radians. DC is an arc of a circle, centre A. Find, correct to 1 decimal place,
(i) the area of the shaded region, [4]
(ii) the perimeter of the shaded region. [4]
Answered by Penny Nom. |
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