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#51 Help Me ! » Regression » 2006-11-27 13:34:51

Prakash Panneer
Replies: 0

A computer printout of a linear regression predicting INCOME based on years of EDUCATION contained:

B    = -92040,   s = 3213       t = 6.67
  0

B   = 228        R = 0.66        df = 23
  1

Which of the following is a correct interpretation of B   ?
                                                                            0

A) We expect to predict INCOME to within 2(92040) of its true value using the equation.
B) We estimate INCOME to decrease $92040 for every 1 year of increase in EDUCATION.
C) We estimate the lowest INCOME of the highest value of EDUCATION of -$92,040
D) The value is highly suspicious depending on whether the years of education of 0 is possible and reasonable.
E) None of these are correct.


Which of the following statements is not correct?

A) The correlation coefficient is approximately 0.81
B) R^2 is a measure of the direction of the relationship between INCOME and EDUCATION.
C) The slope of the regression line is 228.
D) It cannot be determined from the information in the printout which quantity is the independent variable.
E) All are correct.

Thanks in advance.up

#52 Help Me ! » Help me....Limits without using 'L' Hospital's rule » 2006-11-09 10:23:59

Prakash Panneer
Replies: 5

(a) Evluate   lim {2^x^2-cos^2 (x)}/x^2
                x->∞

b)  lim    sin^(-1) x/x
    x->0

For each of the following, either find the limit or state that "no limit exists" and briefly explain
why. Show work used to get your answer.

1.  lim  (2+3sinx)/x^3+1
    x->∞

2.  lim cos x
  x->∞

Thanks in Advance up

#53 Help Me ! » Linear inequality » 2006-11-07 05:23:13

Prakash Panneer
Replies: 1

If a youg man rides his motor-cycle at 25km  per hour, he has to spend Rs. 2 per  km on petrol ; if he rides it at a faster speed of 40 km per hour , the petrol costs increases to Rs. 5 per km. He wishes to spend at most Rs.100 on petrol and wishes to find what is the maximum distance he can travel within one hour . Express this as linear inequality problem and then solve it.

Thanks in advance up

#54 Help Me ! » Please help me with these problems... » 2006-11-04 10:12:17

Prakash Panneer
Replies: 4

Assignment-22

1)If  (2.5)^x = (0.025)^y = 10^3 then find 1/x-1/y.

2)If  log 2  =  0.3010 then find the number of digits  in   1024^1024.

3)If  log 3 = a , log 2 = b then express log 5 6 interms of  'a' and 'b' .

4)If  n is a positive integer then show that  (1111111.....1111)   -   (222222.....2222) is the square of positive integer.                2n times                       n times

5)Out of a group of 20 teachers in a school, 10 teach Mathematics, 9 Physics and 7 Chemistry, 4 teach Math's and Physics and none teach both Math's and Chemistry. How many teach physics only?

6)If  X is a finite set . Let P(X) denote the set of all subsets of  X and  n(X) denote the number of elements in X . If for two finite subsets A, B, n(p(A)) = n(p(B)) + 15. Then find  n(B) and n(A).

7)If  n(U) = 60, n(A) = 21, n(B) = 43 then find  (i) Greatest value of  n ( A U B )
                            (ii)Least value  of n (AUB)
                            (iii) Greatest value of  n ( A ∩ B )
                            (iv)Least value  of n (A∩B)

8)If n(A) = 50, n(B) = 20 and n(A ∩B) = 10     then find  n ( A U B ) ,
n ( A - B ), n ( A ∆ B ).

9)Find the number of integral solutions of x^2-y^2=2006.

10)Find the number of positive integers less than one million whch the digts 5,6,7,8,9,0 do not appear.




Thanks in Advanceup

#55 Re: Help Me ! » Factorization... » 2006-11-02 09:53:33

Prakash Panneer

The answer is (a+b)(a-b)(b+c)(b-c)(c+a)(c-a).

Right?

#56 Help Me ! » Factorization... » 2006-11-02 07:05:16

Prakash Panneer
Replies: 3

Factorise:   a^4(b^2-c^2)+b^4(c^2-a^2)+c^4(a^2-b^2).

Thanks in advance up

#57 Re: Help Me ! » distance » 2006-11-01 07:15:32

Prakash Panneer

sqrt( 180) =sqrt(36 * 5)

               = sqrt(36) sqrt(5)

               = 6 sqrt(5).

Clear?

#58 Re: Help Me ! » Log » 2006-11-01 07:12:56

Prakash Panneer

Sorry, your answer is incorrect.

your question is  log   64/27 =3
                            a

This can be written as a ^ 3 = 64/27

                                  a = (64/27)^(1/3)

                                  a = 4/3.

up

#59 Help Me ! » Please help me!!! One more problem!! » 2006-11-01 01:42:54

Prakash Panneer
Replies: 0

Question: 1                   
                                                                                                                                                     
last trade: 23.10                                                   days range: 23.03 – 23.25
trade time:10:1001 AM ET                                      52wks range: 18.95 – 33.22
change:=0.03 (0.13%)                                          Volume: 1,094,266
prev close: 23.07                                                  avg Vol (3m): 23,342,800
open: 23.09                                                          market cap: 52.47B
bid: 23.09 x 3900                                                  P/E: 18.83
ask:23.10 x 3200                                                  EPS (ttm): 1.23
1 year target : 23.88                                             Div & yield: N/A (N/A)


If P/E(#of share)= market cap (B = billions) approximately how share of dell are held by share hold?
Solve for x.

45x+ 48y^2 - 20y +9

P/E = 18.83

Market cap 52.47B.



Thanks in Advanceup

#60 Re: Help Me ! » i need help On Business math problems.... » 2006-10-31 10:34:54

Prakash Panneer

Another one question:

If P/E(#of share)= market cap (B = billions) approximately how share of dell are held by share hold?
Solve for x.

45x+ 48y^2 - 20y +9

P/E = 18.83

Market cap 52.47B.

Thanks in advance. up

#61 Re: Help Me ! » i need help On Business math problems.... » 2006-10-31 09:34:41

Prakash Panneer

Thanks a lot.

#62 Re: Help Me ! » Please Help Meeeee!!!!!! It's Very Urgent!!!! » 2006-10-31 07:38:30

Prakash Panneer

Can anyone help me???

Pleaseeeeeeeeeeeeeeeeee

#63 Help Me ! » Time notation??? » 2006-10-31 07:19:26

Prakash Panneer
Replies: 6

What is the meaning of time 10:1001 AM ET ?

For which country we represent the time like this?

#64 Help Me ! » Please Help Meeeee!!!!!! It's Very Urgent!!!! » 2006-10-31 05:30:39

Prakash Panneer
Replies: 1

Question: 1                   
                                                                                                                                                     
last trade: 23.10                                                   days range: 23.03 – 23.25
trade time:10:1001 AM ET                                      52wks range: 18.95 – 33.22
change:=0.03 (0.13%)                                          Volume: 1,094,266
prev close: 23.07                                                  avg Vol (3m): 23,342,800
open: 23.09                                                          market cap: 52.47B
bid: 23.09 x 3900                                                  P/E: 18.83
ask:23.10 x 3200                                                  EPS (ttm): 1.23
1 year target : 23.88                                             Div & yield: N/A (N/A)

How close is the Dell's price to its 52-week high?

Question:2

If the trading run from 9:30AM to 4:00 P.M approximately how many hours are left before it closes?

Thanks in Advance up

Please it's very urgent!!!!!!

#65 Help Me ! » i need help On Business math problems.... » 2006-10-31 04:42:13

Prakash Panneer
Replies: 3

Question: 1                   
                                                                                                                                                     
last trade: 23.10                                                   days range: 23.03 – 23.25
trade time:10:1001 AM ET                                      52wks range: 18.95 – 33.22
change:=0.03 (0.13%)                                          Volume: 1,094,266
prev close: 23.07                                                  avg Vol (3m): 23,342,800
open: 23.09                                                          market cap: 52.47B
bid: 23.09 x 3900                                                  P/E: 18.83
ask:23.10 x 3200                                                  EPS (ttm): 1.23
1 year target : 23.88                                             Div & yield: N/A (N/A)

How close is the Dell's price to its 52-week high?

Question:2

If the trading run from 9:30AM to 4:00 P.M approximately how many hours are left before it closes?

Thanks in Advance up

Please it's very urgent!!!!!!

#66 Re: Help Me ! » area of circle » 2006-10-28 11:51:21

Prakash Panneer

Hi,

http://courses.ncssm.edu/goebel/statecon/Topics/triangl/TRIANGL.htm

Go through this site.

This is the answer for your question.

up

#67 Re: Help Me ! » Bodmas » 2006-10-28 06:27:05

Prakash Panneer

First we have to do the powers.

So the answer would be

a) 5 - 1 x 4 - 2 = 62

Then we have to do the multiplication.

that is, 5-4-2 = 62.

Then we have to simplify as usual.

similaly the second.

#68 Help Me ! » Help me with these problems..... » 2006-10-28 06:19:35

Prakash Panneer
Replies: 7

1)Find the number of  Rectangles  on the chess board.

2)The angles of  quadrilateral are in A.P . Greatest angle is double the least.  Find the angles in circular measure.

3)If A, B, C, D are angles of cylic quadrilateral then find cosA + cosB + cos C + cos D .

4)If sin  Ө + cosec  Ө  = 2 then find sin ^n (Ө) + cosec^n (Ө)


5)If  5 sin x + 12 cos x = 7 then find 5 cos x  - 12 sin x.

6)In triangle ABC ,  if  sec2 A + sec2 B =   sec2 A .sec2 B then show that triangle ABC in right angled.

7)If sec A + tan A = a then find sin A in terms of  a.

8)Find equation  of Altitude and median of triangle ABC passing through vertex ' A'  Where
A(1, 2),B(3,4), C (5,1).

9)In a mathematics class ,  20 children had forgotten their rulers and 17 had forgotten their pencils , “ Go and borrow them from some one at once”, said the teacher . 24  children left the room . Find how many children had forgotten both.

Thanks in Advance up

#69 Re: Help Me ! » Volume » 2006-10-27 06:14:13

Prakash Panneer

Is there any practical method?

#70 Re: Help Me ! » Volume » 2006-10-25 05:26:19

Prakash Panneer

I want the Geometric proof.

Can anyone help?

Please....

#71 Re: Help Me ! » Volume » 2006-10-24 12:09:59

Prakash Panneer

Geometric proof.up

#72 Help Me ! » Volume » 2006-10-24 09:17:25

Prakash Panneer
Replies: 7

How will you prove the volume of the cone is one-third of the volume of the cylinder?

dunnoThanks in Advance up

#73 Help Me ! » Help me with these problems... » 2006-10-24 06:08:34

Prakash Panneer
Replies: 9

1)A bag contains 5 red , 4 green and 3 black balls . Three balls are drawn out of it at random, find the probability  of drawing exactly 2 red balls.

2)There are 4 envelopes corresponding to 4 letters. If the letters are placed in the envelopes at random, what is the probability that all the letters are not placed in the right envelopes.

3)From a pack of 52 playing cards, three cards are drawn at random . Find the probability of drawing a king, a queen and a jack.

4)If a leap year is selected at random, what is  the chance that it will contain 53 Tuesdays?

5)What are the odds in favour of throwing at least 8 in a single throw with two dice?

6)A coin is tossed successively 3 times . Find the probability of getting exactly one head or two heads.
7)6 boys and 6 girls sit in a row randomly , find the probability that all the 6 girls sit together.
8) A boy has 6 pockets . In how many ways can he put  5 coins in his pockets?

9)In how many ways can 5 letters be posted in 7 letter boxes in a town?  If all the letters are not posted in the same  box , find the corresponding number of ways of posting .

10)Find the number of 3-digit numbers that can be formed with the digits  1,3,5,7,9
when  a digit may repeated any number of  times.


Thanks in Advance up

#74 Re: Help Me ! » Log » 2006-10-13 04:48:20

Prakash Panneer

The exponential form a^x = b can be written as,

                 log  b = x.
                    a

The problem is log 125 = 3.
                          b

It can be written as b^3 = 125.

                            b^3 = 5^3.

                                b =5.
up

#75 Re: Help Me ! » quadratic formula » 2006-10-12 05:50:40

Prakash Panneer

If it is a quadraic equation, then the equation is 3x^2-2x+5 = 0.

Then the solution is,

           x =         2 +-Sqrt((-2)^2- 4*3*5)
                          ____________________
                                         2*3


          x =    2 +- Sqrt(4 - 60)
                   _____________
                             6


          x = 2+- Sqrt(-54)
               ____________
                       6

         x = 2+- Sqrt( -9 * 6)
               ______________
                          6

         x = 2 +-  3Sqrt(6) i
               ____________
                       6


         x = 2 + 3 Sqrt(6) i          and 2 - 3Sqrt(6) i
               ____________                ___________    ( Sqrt(-1) = i )
                       6                                   6


This equation has complex roots.

up

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