2,563 Answered Questions for the topic Maths

Maths

06/21/15

three consecutive even numbers sum to 30. A simplified equation that models this situation could be?
three consecutive even numbers sum to 30. A simplified equation that models this situation could be?
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06/20/15

if 32 students in a class are females and the ratio of female to male students is 16:9 ,then what percentage of the class is female ?
the options are  : 32% 36% 56.25% 72%   okay, so i thought this one is easy and tried it :     let  x be total students .   if 32 are females then males would be (x-32),    and using... more
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Maths

06/20/15

maths polygon ques. help please...
ABCD is a convex quadrilateral. 3,4,5 and 6 points are marked on the sides AB, BC,CD and DA  respectively . The number of the triangles  with vertices on different sides  is... more
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06/20/15

the total cost of 3 books and 4 pens is rs 520.If each book costs twice as much as a pen, how much does a pen cost
the total cost of 3 books and 4 pens is rs 520.If each book costs twice as much as a pen, how much does a pen cost
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06/19/15

probability help required please..
seven digit number  from the digits   1,2,3,4,5,6,7,8,9  are written in a random  order .The probability that this seven digit number is divisible by 9 is?   1/9 1/3 1/5 2/9
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Maths Integration

06/19/15

maths integration help please...
0∫ ∏  [sin (n + (1/2) ) X] / sin X dx equals : (2n +1 ) x ∏ / 2 0 ∏ n∏
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Maths

06/18/15

3. It costs £252 to paint an area of 84m². How much would it cost to paint an area of 65m²?
plz show the way also    thanks
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06/18/15

complex numbers related question
if   x = [ (√ 3 / 2)  +  ( i/ 2) ] then  x2  is  :      -1     1     -i     i %MCEPAS  , thenTEBIN%
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Maths

06/15/15

Mathematics Help
If the tangent line of parabola y= 4x-x^2 at M(1,3) is also the tangent line of parabola y=x^2-6x+k, then the value of 5- square root(k-1) is...   a.0 b.1 c.2 d.3 e.4
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Maths Math Groups

06/14/15

Group axioms proof
A group is a collection G that satisfies the following 3 axioms: 1) associativity a·(b·c)= (a·b)·c 2) identity element e: e·a=a ∀a in G 3) Inverse. Each element a in G has an inverse a-1 such that... more
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06/12/15

Conjugacy classes of loop
If we consider the symmetry group H of rotations and reflections of 3 equidistant points on a circular loop then the group elemetns in cycle notation are:    e: (1)(2)(3) a: (123) b: (132) c:... more
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06/11/15

Chi square test, what is null and proposed hypothesis
According to genetic theory the number of colour strains, red, yellow, blue and white in flower A should appear in proportions 4:9:8:4. Observed frequencies of red, yellow, blue and white strains... more
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06/07/15

Salary of Mr. X is 50% more than salary of Mr. Y. What percent of Mr. X's salary is Mr.Y's?
Salary of Mr. X is 50% more than salary of Mr. Y. What percent of Mr. X's salary is Mr.Y's?
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Maths

06/06/15

Maths help
1.x1 and x2 are positive integers of a quadratic equation x^2+ax+b=0. If 12,x1,x2 are the first three rates of an arithmetic line and x1,x2,4 are the first three rates of a geometric lin,then the... more
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Maths Chemistry

06/05/15

Chemistry And maths help...
1.The cel of a concentrated side-cube contains 8X atoms on the cell corner and 6Y atoms on its side.What is the empirical formula of the solid?A.XY3B.X2Y3C.X3YD.X2Y4E.X3Y22.A sample of ammonia gas... more
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Maths Math Help

05/31/15

Find dy/dx at the point (0,1), if y5 = (x + 2)4 + ex ln y-15.
Find dy/dx at the point (0,1), if y5 = (x + 2)4 + ex ln y-15.   This question has me, I've tried it numerous times yet it doesn't seem to work.
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Maths

05/24/15

Ali receives a weekly allowance of £15, Charlie receives £5 and Henry receives £7.50.
What fraction of Ali's allowance does Charlie receive? Also can I have the working out please.
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Maths

05/19/15

what quantity of water should be added to make 12 lts of 50% acidic solution to 40% of acidic solution?
What quantity of water should be added to make 12 lts of 50% acidic solution to 40% of acidic solution?
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Maths

05/14/15

I want to flash pasteurise my cider making it subject to 74 degrees Celsius for 30 seconds
To do this I have a tank of water heated to 74 degrees Celsius and the cider will pass through the tank at point A in a stainless steel pipe and leave at point B. If the flow rate of the cider is... more
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05/12/15

Partial derivatives help
I'm having problems finding the following: say F = -kTN*ln(2*cosh(βμB)) where everything is a constant and β=(1/kT) I want to find S = -(∂F/∂T) and the answer should be S = kN[ln(2*cosh(βμB)) -... more
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Maths

05/11/15

ABCD IS TRAPEIZUM WITH AB PARALLEL. F IS THE MID POINT OF BC. DF AND AB ARE PRODUCED TO MEET AT E. SHOW THAT F IS ALSO THE MID-POINT OF DE.
ABCD IS TRAPEIZUM WITH AB PARALLEL. F IS THE MID POINT OF BC. DF AND AB ARE PRODUCED TO MEET AT E. SHOW THAT F IS ALSO THE MID-POINT OF DE.
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Maths

05/11/15

how far does she travel by train?
Zoe lives 22km from school. she walks 15% of the way and 55% of the way she takes the bus. The remainder of the journey is by train.
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05/11/15

Octahedron rotational symmetries help
So consider the symmetry group G of the regular octahedron i.e. an octahedron whose sides are all the same size and shape. There are 13 axes of symmetry but now I want to determine all the elements... more
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Maths

05/10/15

Probability
The pharmaceutical company buys 400 batteries for running some specialist equipment. These batteries have a mean life of 155 hours and a standard deviation of 30 hours. Assume the battery life... more
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Maths

04/28/15

Mathematics
A band of 11 pirates once stole a number of gold coins.When the pirates tried to divide the coins equally among themselves, 1 coin was left over. The greedypirates fought over the remaining coin... more
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