Sunday

August 28, 2016
Total # Posts: 45

**chemistry**

a given sample of MgCl2 solution has 6×10^23 ions. what is the number of Cl(-1) ions in the same solution?
*July 16, 2016*

**Math**

there are 7 apples and 3 pears in a basket . in how many different ways can we pick an apple ?
*June 22, 2016*

**esl**

How can i learn englsih writting or reading have understandable quick or soon.
*June 17, 2016*

**probabilities**

Suppose that a certain type of metalic tube contains on the average five defects per 900 feet. Let X be the number of defects per 900 feet 1. What distribution does X follows ? 2. What is the probability that a tube 900 feet long contains no defects ? 3. What is the ...
*April 26, 2016*

**probabilities**

A radioactive source of material emits a radioactive particle with probability 1/100 in each second. Let X be the number of particles emitted in one minute. 1. Determine the probability distribution, the expected value and the variance of X. 2. Calculate the probability that ...
*April 26, 2016*

**probabilities**

A multiple choice test has 16 questions. Each question has 4 possible answers with only one is correct. Assume that all questions are answered and the probability to answer any question correctly is 0.25. Let X be the number of questions answered correctly among 16. 1. What ...
*April 26, 2016*

**probabilities**

A weighted coin is flipped 200 times. Assume that the probability of a head is 0.3 and the probability of a tail is 0.7. Each flip is independent from the other flips. Let X be the total number of heads in the 200 flips. 1. What is the distribution of X ? 1 2. What is the ...
*April 26, 2016*

**probabilities**

Let X be a Poisson random variable with µ = EX = 0.4 and let Y be another random such that E[(2Y + 1)2 ] = 10 and E[(Y − 1)2 ] = 4 Consider the random variable Z such that Z = 3X + 4Y + 2. 1. Find E(X2 ), E(Y 2 ) and E(Z). 2. Suppose that X and Y are independent, ...
*April 26, 2016*

**probabilities**

Consider a binomial random variable X with parameters n = 100 and p = 0.1, and let Y be a Poisson random variable with E(Y ) = 2. Suppose that V ar(X+3Y ) = 21. 1. Find E(X), V (X) and V (Y ). 2. Determine E(X + 3Y ) and deduce E[(X + 3Y ) 2 ]. 3. Find Cov(X, Y ). Are X and Y ...
*April 26, 2016*

**probabilities**

The random variable X has the Poisson distribution with parameter λ > 0. According to Chebeyshev’s Theorem, P(s < X < 99) ≥ 3/4. 1. Determine the value of k in the Chebeyshev’s inequality. 2. Determine the value of s
*April 26, 2016*

**physics**

A force makes an angle of 60° with y-axis.Find x-component of force.
*February 13, 2016*

**Chemistry**

sample of alumium has a mass 6.3g.calculate the number of mole of alumium present and the number of atom of alumium in the sample(AL=27
*January 16, 2016*

**science**

A circular hole of 150 mm diameter is to be punch out of a 2 mm thick plate. the shear stress needed to cause fracture is 400 Mpa. calculate the minimum force to be applied to the punch.
*October 19, 2015*

**Physics**

A car skidded on a roadway that has a coefficient of friction with the road of 0.7. A police officer measured the skid marks and noted them to be 100 feet long. Two years later at trial, the lawyer for the driver argues that the officer did not measure the skid marks correctly...
*April 28, 2015*

**Problem Solving**

the average giant pacific octopus weighs about 75 pounds. the largest octopus ever found weighed 8 times this amount. how much did the largest octopus weigh
*November 24, 2014*

**math **

Carina has twice as many quarters as dimes. If she has $3.60, how many quarters does she have?
*November 24, 2014*

**math**

Ron has $1.35 in dimes and quarters in his pocket. If there are twice how many quarters does he have?
*November 24, 2014*

**math**

Ron has $1.35 in dimes and quarters in his pocket. If there are twice as many dimes in his pocket as quarters, how many quarters does he have?
*November 24, 2014*

**physics**

A 1.2 kg tether ball is hit so that it circles the pole with an angular speed of 3 radians/s. The length of the tether is 2m. What is the angle measured from the tether to the vertical pole?
*November 4, 2014*

**Precalc Translations**

Let T(d) be the temperature of the seawater in the Mariana Trench d meters below the surface. Find a formula for p(x), the temperature x mm below the surface Insert 1 for coefficients that do not change and 0 for shifts that are not necessary My answers p(x) = 1, T( ) x - 0...
*October 17, 2014*

**statistics for health research**

It is clear that because in normal distribution curve within 1 standard deviation (700-800)at 68.34% and within 2SD (650-850)at 95%
*June 16, 2014*

**math**

A study of 60 bolts of carpet showed that their average length was 180 yards. The standard deviation of the population is 6 yards. Which of the following is the 99% confidence interval for the mean length per bolt of carpet?
*April 14, 2014*

**Algebra 2**

fourth root of (68-48sqrt2)
*February 8, 2014*

**Gage university college**

Ineed helping full for account
*August 13, 2013*

**Gage university college **

I need your helping for assigment of account
*August 13, 2013*

**science**

10 name of acid and alkalies and there uses
*July 18, 2012*

**biology**

talk about the ethanol dissolving the phospholipid bi layer of the membrane, and the protein as the tertiary structure is ruptured. Also reliability- didnt do any repeats etc, you can use repeats to make an average so it is more accurate. do your results support the hypothesis...
*January 31, 2012*

**physics**

What will be the magnitude of work if a force of 25N pulls a stone through distance of 5m in its direction ?
*January 14, 2012*

**Quadrilateral**

Maths
*January 8, 2012*

**geometry**

in the diagram of collinear points, GK = 24, HJ = 10, and GH=HI=IJ. Find each length.
*August 31, 2011*

**physics**

A length of wire carrying a current i and bent into a circular coil of one turn.The same length of wire has been out to give a coil of 5 turns, each of 1\5 the original radius.If Ba and Bb are the magnitudes of the magnetic fields at the centers of the two coils, what is the ...
*June 16, 2011*

**physics**

a fly moves from one corner of the floor of a room and you are standing opposite corner into the room .Describe the displacement of the fly when it covers half of the distance.
*June 2, 2011*

**physics**

a fly moves from one corner of the floor of a room and you are standing opposite corner into the room .Describe the displacement of the fly when it covers half of the distance.
*June 2, 2011*

**accounting**

Sales (net) 126.000 2013 cgs 75.000.margin 51000,operating expenses 30.000 net income 21.000
*April 4, 2011*

**shaheen**

wha interesting object are found from moen jo daro?
*February 15, 2011*

**adult education**

qs-5000-15000-2(7500)+15000p
*August 13, 2010*

**11th grade**

what is the systematic widespread effort to manipulate people`s ideas
*March 20, 2010*

**us history**

systematic widespread effort to manipulate people`s ideas
*March 20, 2010*

**us history**

modern world peacekeeping organization
*March 20, 2010*

**grammar**

Concentration does not mean think one idea.
*March 4, 2010*

**calculus ||**

use a grapher to fine the length numerically (x)=2sin (y) ,pi/3 < y< 2pi/3
*February 14, 2010*

**college chemistry**

A substance's heat of fusion is the quantity of thermal energy involved in the solid/liquid phase change. When water freezes it releases 6.02kJ for each 18.0 grams (1 mole) that freezes. When it melts, each mole must gain 6.02 kJ of energy. Remember that there is no ...
*January 24, 2010*

**4th grade math**

Rodney is three times as old as his sister. Ayear ago he was four times as old. How old are rodney and his sister now?
*January 18, 2010*

**Math**

In how many ways can a person choose 3 movies to see in a theater playing 11
*October 7, 2009*

**Chemistry Titration Lab HELP!**

what's suggest an application for acid/base titration
*June 11, 2008*

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