Wednesday
December 17, 2014

Posts by Maths


Total # Posts: 32

Maths
You shouldn't be asking for help in the maths challenge. It is against the rules.
April 26, 2014

maths
i am a two digit number above 50. the sum of my digits is 12. and the difference of my digits is 4. who am i?
April 13, 2014

Lara
Alice has 4 times as much money as Benny. If Benny has $36 less than Alice, how much money do they have altogether? A $45 B $48 C $60 D $180
January 18, 2014

Maths
Is given a function: f(x)=x2 + px + q Prove that: f(x+1) + f(x-1)= 2+2 f(x)
August 20, 2013

maths
A factory produces two products A and B using raw materials p and q. It uses 3 units of p and 1 unit of q to produce one unit of A. It uses 1 unit of p and 2 units of q to produce one unit of B. The maximum daily supplies are 330 units of p and 220 units of q. If the profit ...
July 9, 2013

maths
A subset S of {1,2,…,n} is said to be packed if whenever i,j∈S the number ⌊(i+j)/2⌋ is also in S. Determine how many subsets of {1,2,…,25} are packed. Details and assumptions i and j need not be distinct. If i=j is in the set, then clearly so is &#...
July 9, 2013

physics
The efficiency of a machine is in general defined as the ratio between useful (released) energy and the input energy. Therefore, the exact formulas for efficiency depend on the purpose of the machine. What's the difference in the maximal efficiency of a heat pump and a ...
July 9, 2013

maths
Suppose p(x)=ax^2+bx+c is a quadratic polynomial with real coefficients and |p(x)|≤1 for 0≤x≤1. Find the largest possible value of |a|+|b|+|c|.
July 9, 2013

maths
Find the smallest n such that for any prime p, at least 20 numbers 1,2, ..., n are quadratic residues not modulo p. k is quadratic residue modulo p if there exists an integer j such that j^2 ≡ k (mod p).
July 2, 2013

maths
f(x)=x ^2 +bx+c , b and c real .Find the minimum of (max|f(x)|)for x∈[−10,10]?
July 2, 2013

maths
There are N ordered integer quadruples (a,b,c,d) subject to 0≤a,b,c,d≤99990 such that ad−bc≡1(mod99991). What are the last three digits of N?
April 6, 2013

math
16x+8x+4x^2-16x+20+10+5x-20therefore 4x^2+8x+5x+10 4x^2+13x+10
January 20, 2013

Geometry
jdfbdjhfkdjkglrgkldfghkghdfjgfl;dffldjgklfdl;dfklgghjklgkhjlhjd;flfdkhfdkgjkkdffdjlhlddflfklhjkldsedkfsdjgfjofogtojgsdfsjellldfgk;...
July 22, 2012

math
a sack contain 10 blue and 6 red crayons another sack contains 9 blue and 12 red crayons two crayons are drown at random without replacement from each sack. what is the probability that all the four crayons are blue? exactly one of the four crayons is red
May 21, 2012

statistics
A computer course is conducted for 24 days.Each day 48 persons attended the course.To prepare a day wise work done sheet for all 24 days,find the estimated and the actual number of persons attended the course.Is the estimated value more or less than the actual value?Find its ...
October 25, 2011

Maths
Please show me the way of using formula log?
October 14, 2011

question (doubt)....
solve to find x and y:- x^3+8y^3+x+2y=0
June 11, 2011

trigonometry...........
Prove the following identity:- (i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx
June 11, 2011

MATHS......
solve the following. 1) x^3+3y^3+x+2y
June 10, 2011

TRIG..............
Q.1 Prove the following identities:- (i) tan^3x/1+tan^2x + cot^3x/1+cot^2 = 1-2sin^x cos^x/sinx cosx (ii) (1+cotx+tanx)(sinx-cosx)/sec^3x-cosec^3x = sin^2xcos^2x.
June 10, 2011

MA
a) find the equation of AB, the perpindicular bisector of the line joining the points P(-3,1) and Q(1,9) (line AB intersects the point at midway of PQ) b) C is the centre of a circle passing through P and Q. given that QC is parralel to the yaxis, determine theequation of the ...
January 18, 2010

maths
a) find the equation of AB, the perpindicular bisector of the line joining the points P(-3,1) and Q(1,9) (line AB intersects the point at midway of PQ) b) C is the centre of a circle passing through P and Q. given that QC is parralel to the yaxis, determine theequation of the ...
January 17, 2010

general maths
A study of motor vehicle rates in the 50 states reveals that traffic death rates (deaths per 100 million motor vehicle miles driven) can be modeled by the normal curve. The data suggest that the distribution has a mean of 5.3 and a standard deviation of 1.3. Sketch the normal ...
September 7, 2009

Maths
a tray holds 2.3 liters of water when full (2300 cm3) Calculate the height (h cm) of the tray Tray = L=15cm B=20cm H=?
June 14, 2009

math
thank you
May 26, 2009

math
given that a/b=c/d, decide whether it is true or not that a/c=b/d. and how can i explain my reasoning?
May 26, 2009

math
thank you
May 26, 2009

math
are all regular hexagons similar? how can i explain?
May 26, 2009

goemetry
thnx
May 26, 2009

TP
What is Standard Deviation? As in what does it measure, is it a measure of spread of a graph of results?
May 29, 2008

K
(a) Find the indefinite integrals of the following functions. (i) f (t) = 6 cos(3t) + 5e^−10t (ii) g(x) = 21-12x^3/ x (x > 0) (iii) h(u) = cos^2( 1/8 u) (b) Evaluate: (this big F sign at the start, 5 at the top and 1 at the bottom) 5 1/4x (7 + 6x^2) dx F 1 (c) (...
March 24, 2008

unscrambling word
mbicned
June 14, 2005

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