# Posts by Ri

Total # Posts: 64

**Probability and Statistics**

Perhaps an easier way to understand it would be this -- assume friends 1, 2, 3 like ice creams A, B, C and friends 4, 5, 6 like ice creams D, E, F. We know that each friend has to like exactly four flavors, so we must assign each of them to one more ice cream. (Right now, ...

**History**

Thanks Josie!

**Physics**

Ignore this question someone posted something similar!

**Physics**

A baseball is hit so that it travels straight upward after being struck by the bat. A fanobserves that it takes 3 seconds for the ball to reach it's maximum height. Find the balls initial velocity and the height it reaches. My teacher gave me a similar problem to this but ...

**Grammar**

Thank u Steve :)

**Grammar**

So now m posting the answers along witg the questions... Plz correct me if m wrong ! ^^ Tranformation of Sentences ? 1.He wont show me his papers,he wont tell me who he is (use neither -nor) Ans.He neither would show me his papers nor he would tell me who he is. 2.This is all ...

**Grammar**

Tranformation of Sentences ? 1.He wont show me his papers,he wont tell me who he is (use neither -nor) 2.This is all i posses.(Turn to negative) 3.No man in tge street came forward to help her.(Turn to Assertive) Plz post in the answers directly.. I will check if it matches ...

**Grammar**

Thnx

**Grammar**

Tense: 1.Unless we ___ (start) now we cant be on time ? 2.He thanked me for what i ___(do) for him? 3.The fatal car accident __(occur) at 10.30 this morning. Are these correct ? 1.start 2.had done 3.occured

**Grammar**

Thank you :)

**Grammar**

So which will it be ? By or With ? one answer ?

**Grammar**

1.in ? 2.on ?

**Grammar**

Preposition: I would like to pay the amount __cheque ? The boat goes__river ?

**Grammar**

Preposition: Sri Lanka is __ the south of India. And what will happen if Sri Lanka is replaced with any other state within the country India ?

**Grammar**

The pen is often compared ____ a sword... Will it be "to" or "with" Pls tell me when to use to and when to use with ? What will be the above answer ?

**Math**

@steve... can u please elaborate ?

**Math**

Is Lagrenge's mean value theorem applicable to f(x)=|x| on the interval [-1,2]

**Math**

What will be its differential equation? y^2-2xy+x^2=a^2

**Math**

Thanx a lot steve :)

**Math**

2x dy/dx+y=6x^3 How to solve ?

**Math**

@steve... now i further solved it... thnx.. ur answer is correct :) :)

**Math**

@steve... i got c=2 log 2 .. before putting the pts i got the equation logy+log(1+x^2)=logc

**Math**

Fnd the equation of the curve through the point (-1,2) of the differential equation dy/dx = -2xy/(x^2+1)

**Math**

@steve... ow... its ok... i did it in another sum where d 2 comes n mistakenly wrote it here... appreciate ur help :)

**Math**

@steve ...i got the final ans as log y = 2[log(x-1)+(x-1)^3/3+3(x-1)+3/2(x-1)^2] is it correct ?? did it by 2nd method

**Math**

integrate x^3/(x-1) w.r.t x How do i get the answer ?

**Math**

@steve... uhm.. no... its supposed to be a differential equation.... is it ok if we only do one step differential n eliminate a ?

**Math**

Form the differential equation of the family of curves y^2-2xy+x^2=a^2, a=arbitary const. I really need to know the answer!!

**Math**

@Reiny...Thank you :)

**Math**

If vector a=2i-j+k, b=i-3j+k,c= -2i+j-3k,d=3i+2j+5k find the p,q,r such that d=pa+qb+rc. Please help me how to do it...!!!

**Biology**

Two techniques which can help in early detection of bacteria or virus infection much before the symptoms appear in the body?

**Biology**

Name an organ which is formed of tissues of two different individuals.

**Biology**

Name of the vaccine which is obtained from transgenic yeast . Searched it but cant find it... Plx help !

**Biology**

Mammals and birds have evolved from reptiles. In what way does a comparative study of their embryology establish the validity of the statement ? P.S I don't have the"Modern Biology" Book ... so plz help me with the note!

**Biology**

@bobpursley....d fact is.... I don't have the book... Dats d reason why m posting this ... wondering if someone could help me with the problem :)

**Biology**

Mammals and birds have evolved from reptiles. In what way does a comparative study of their embryology establish the validity of the statement ?

**English Grammar**

@Ms.Sue... Thnk u ! i ll post u directly wen i hv trouble with grammar later :)

**English Grammar**

@Ms.Sue.... really? i want these to be 100% correct though!

**English Grammar**

@Ms.Sue 1.at 2.on

**English Grammar**

Prepositions 1. The examination is ____ hand. 2.The office is closed ____ the second and fourth saturday.

**English Grammar**

Change it to positive without changing the meaning. No man in the street came forward to help her. Should it be "Every man in the street stood where they were."??

**English Grammar**

Please check if its correct Change from Positive to Negative 1.None of them were bad - All of them were good 2.Nobody was present in the funeral function -Everybody was absent from the funeral function

**English Grammar**

@writeacher... 1.No man in the street came forward to help her. -Every man in the street stood where they were.

**English Grammar**

@writeacher... well srry fr nt mentioning it in the first place ... But yes , its changing to positive without changing the meaning.. so is my answer correct ?

**English Grammar**

@writeacher.... i think ur not correct... u have to change it to positive without changing the meaning. Should it be "Every man in the street stood where they were."

**English Grammar**

Change to Affirmative 1.No man in the street came forward to help her. 2.None of them were bad. 3.Nobody was present in the family function.

**Chemistry**

What is the principal of seperation of metal ions in qualitative analysis?

**Chemistry**

its given in a reference book 4-7...is it correct ?

**Chemistry**

Is optimum ph for enzyme 7-14?

**Chemistry**

which element in the first transition series do not exhibit variation of oxidation state and why?

**Social Studies**

@Quincy That's your own fault

**Math**

The bookseller sells packages of 15 pens each and 12 pencils each.they want the same number of pens and pencils in their next order.find the smallest number of packages

**Education**

In studies involving children, the ____ should have the final word in deciding whether they should participate. A. Children B. Researchers C. Therapists D. Parents I think it is either B or D. I am conflicted because parents would have already agreed to letting their child ...

**Education**

Dr. Muse, a sociocultural theorist, speculates that children's ability to reminisce about the past can be promoted through adult teaching. This is an example of a A. Theory B. Research Question C. Hypothesis D. Research method I have read my book, but haven't found any...

**Education**

You are right, it is B. Even though it focuses in children's cognitive and social decelopment, the study is to understand constancy and change from conception through adolescence, so it is not limited to C. Thank you!

**Education**

Which of the following statements about the field of child development is correct? A. It’s devoted to understanding human constancy and change over the lifespan. B. It’s part of a larger, interdisciplinary field known as developmental science. C. It focuses primarily...

**Physics**

Consider a “semi-infinite” nonconducting rod (that extends infinitely to the right only) and has a uniform charge density. Calculate the magnitude and direction of the electric field at the point, P, which is a distance of R away from the edge of the rod. Does the ...

**Physics**

As a comet swings around the Sun, ice on the comet's surface vaporizes, releasing trapped dust particles and ions. The ions, because they are electrically charged, are forced by the electrically charged solar wind into a straight ion trail that points radially away from ...

**Physics**

An electric generator contains a coil of 100 turns of wire, each turn forming a rectangular loop 50cm by 30cm. The coil is placed entirely in a uniform magnetic field with magnitude, B = 3.5T and direction initially perpendicular to the coil's plane. What is the maximum ...

**Physics**

In a certain cyclotron a proton moves in a circle of radius 0.5m. The magnitude of the magnetic field is 1.2T. a) What is the oscillator frequency? b) What is the final kinetic energy of the proton?

**Physics**

2) A solid nonconducting sphere of radius R = 5.6cm has a nonuniform charge distribution or volume charge density p= (1.41pCm^-3)r/R, where r is the radial distance from the sphere's center. a) What is the sphere's total charge? b) Calculate AND sketch a graph of E ...

**Physics**

Near the equator, the Earth's magnetic field point almost horizontally to the north and has a magnitude of B = 50 micro T. What should be the magnitude and direction for the velocity of an electron if its weight is to be exactly balanced by the magnetic force?

**Physics**

You decide to build a cyclotron (because you are bored) that will accelerate protons to 10% of the speed of light. The largest vacuum chamber you can find is 50cm in diameter. What magnetic field strength will you need?

**math**

A,B,C, and D are sitting along one side of a table. In how many different orders could the four friends be sitting?