Wednesday
April 16, 2014

Posts by Maths


Total # Posts: 30

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?

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

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

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 pe...

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 ...

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 hea...

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|.

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).

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

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?

Geometry
jdfbdjhfkdjkglrgkldfghkghdfjgfl;dffldjgklfdl;dfklgghjklgkhjlhjd;flfdkhfdkgjkkdffdjlhlddflfklhjkldsedkfsdjgfjofogtojgsdfsjellldfgk;flflgkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk...

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 d...

Maths
Please show me the way of using formula log?

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

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

MATHS......
solve the following. 1) x^3+3y^3+x+2y

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.

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 ...

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 ...

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 ...

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=?

math
thank you

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?

math
thank you

math
are all regular hexagons similar? how can i explain?

goemetry
thnx

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

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) (...

mensuration
mensuration work shop calculation

unscrambling word
mbicned

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