Thursday

July 30, 2015

July 30, 2015

Total # Posts: 34

**speed time distance**

a train running at the speed of 180 km hr crosses a 365 meter long platform in 21sec. what is the length of the train
*June 8, 2015*

**math**

prove that the value of cosx + secx can never be 3/2.
*April 30, 2015*

**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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