Tuesday

December 1, 2015
Total # Posts: 94

**Chemistry**

Calculate the molar concentration for each of the following. a)The concentration of a brine solution containing 225 g for pure sodium chloride dissolved in 4.00 L of solution. b)The volume that must be added to 4.2 mol of magnesium chloride to make a 0.045 M solution. c)The ...
*November 22, 2015*

**trigonometry**

From the roof of the building 25 meters high, the angle of elevation of the top of the pole is 21°11’ , from the bottom of the building, the angle of elevation is 43°2’, determine the height of the pole .
*July 27, 2015*

**math**

There are 50 red and green marbles in a basket, if there are 30 red marbles. Find the probability that exactly 5 of the 10 are green, if 12 are drawn?
*June 12, 2015*

**math**

How to use an elimination strategy to solve the linear system: 5/3x +1/4y = 10 1/3x + 1/2y = 5
*April 10, 2015*

**math - plz help!!**

How to write three linear system that are equivalent to the linear system shown? 5x-4y= -3 2x + 7y= 5
*April 10, 2015*

**math**

How to write three linear system that are equivalent to the linear system shown? 5x-4y= -3 2x + 7y= 5
*April 9, 2015*

**math**

Thank you for answering =)
*April 9, 2015*

**math**

how do you get this ? x + 10 = 5 x - 20
*April 9, 2015*

**math**

What is the value of x in the system shown? y=1/5x+2 y=x-4
*April 9, 2015*

**math**

can you explain in details? Plz and thank you
*April 9, 2015*

**math**

What is the value of y in the system shown? y=12x-3 y=-2x+4 Thanks
*April 9, 2015*

**Physics**

Can someone show me and explain a step by step process how to do this problem? Thanks 1) Two equal but opposite charges re separated by a distance d. Determine a formula for VBA = VB – VA for points B and A on the line between the charges situated as shown. |<...
*February 8, 2015*

**childcare**

A very young child takes his socks off. The caregiver puts it back on. This process is repeated over and over. The child is engaging in __________ play.
*January 28, 2015*

**math**

write the simplest ratio for each: 18:21, 14:35, 10:12, 24:32, 21:24
*September 5, 2014*

**physics**

rex stands 3m away from a concave mirror.his hieght is 1.70m. If the image formed on the screen is 12cm from the mirror,what is the size of the image
*July 5, 2014*

**Maths**

how do you find the hypotenuse of a triangle
*May 7, 2014*

**statistics**

Needing help to get this answer right. _c___ 3. What is the relationship between the alpha level, the size of the critical region, and the risk of a Type I error? a. As the alpha level increases, the size of the critical region increases and the risk of a Type I error ...
*December 29, 2013*

**statistics**

Needing some help to clarify this problem and help finding the right answer. _b___ 2. Which of the following accurately describes the critical region? a. outcomes with a very low probability if the null hypothesis is true b. outcomes with a high probability if the null ...
*December 29, 2013*

**statistics**

A sample of n = 25 scores has M = 20 and s2 = 9. What is the sample standard deviation? a. 3 b. 4.5 c. 9 d. 81
*December 26, 2013*

**statistics**

In a population of N = 10 scores, the smallest score is X = 8 and the largest score is X = 20. Using the concept of real limits, what is the range for this population? a. 11 b. 12 c. 13 d. cannot be determined without more information
*December 26, 2013*

**Statistics**

A researcher measures eye color for a sample of n = 50 people. Which measure of central tendency would be appropriate to summarize the measurements? a. mean b. median c. mode d. any of the three measures could be used
*December 25, 2013*

**Statistics**

For a negatively skewed distribution with a mode of X = 25 and a median of 20, the mean is probably ____. a. greater than 25 b. less than 20 c. between 20 and 25 d. cannot be determined from the information given
*December 23, 2013*

**Statistics**

One item on a questionnaire asks, "How many siblings (brothers and sisters) did you have when you were a child?" A researcher computes the mean, the median, and the mode for a set of n = 50 responses to this question. Which of the following statements accurately ...
*December 23, 2013*

**s**

Thank you both for helping with this. I'm so glad that you all are here.
*December 23, 2013*

**s**

In a correlational study a. 1 variable is measured and 2 groups are compared b. 2 variables are measured and 2 groups are compared c. 1 variable is measured and there is only 1 group of participants d. 2 variables are measured and there is only 1 group of participants
*December 23, 2013*

**Statistics**

Can someone please help with this problem to advise how to set up and in the book Essential of Statistics for the Behavioral Sciences. A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n=25 third-...
*December 20, 2013*

**Statistics**

If the alpha level is changed from a=.05 to a=.01. a. What happens to the boundaries for the critical region? b. What happens to the probability of a Type I error?
*December 20, 2013*

**Statistics**

True or False In most research situations, the goal of a hypothesis test is to reject the null hypothesis.
*December 20, 2013*

**Statistics**

True or False The null hypothesis is stated in terms of the population, even though the data come from a sample.
*December 20, 2013*

**Statistics**

By definition, a Type I error is ____. a. rejecting a false H1 b. rejecting a false H0 c. rejecting a true H0 d. rejecting a true H1
*December 20, 2013*

**Physics**

B_0 in both cases seem difficult cannot get it, please help!
*May 11, 2013*

**English**

i need help with the same question
*April 11, 2013*

**algebra**

The model t=100+12 x represents the cost, in dollars of renting a car, where x is the number of days the car rented. What’s the total rental cost if one rents the car for 5 days.
*February 7, 2013*

**math**

I bought 16.8 gallons of gas at a cost of $61.47. Estimate the unit price(cost per gallon)
*February 5, 2013*

**Algebra with applications**

A poll was taken of 100 students at a commuter campus to find out how they got to campus. The results were as follows: 23 said they drove alone. 30 rode in a carpool. 31 rode public transportation. 4 used both carpools and public transportation. 3 used both a carpool and ...
*January 27, 2013*

**Physics **

A crate is initially at rest on a rough, horizontal floor. The crate moves in a straight line as it is pushed resulting in the crate speeding up at a constant rate of 3.89 m/s2. After a while, the crate is no longer being pushed and the crate slows down at a constant rate of 5...
*January 25, 2013*

**Math**

Sally dilivered 148 newspapers and recieved $0.03 per paper. What were her earnings?
*January 15, 2013*

**physical chemistry**

2 liters of N2 at 0 degree Celsius and 5 atm pressure are expanded isothermally against a constant pressure of 1 atm until the pressure of the gas is also 1 atm. Assuming the gas to be ideal, what are the values of work,delta E, delta H, and q for the process?
*September 29, 2012*

**physial chemistry**

a weight of 1000g falls freely to a platform from a height of 10 meters. What amount of heat will be evolved when the weight strikes the platform?
*September 29, 2012*

**physical chemistry**

piston whose area is 60 cm2 moves through a distance of 20 cm against a pressure of 3 atm. calculate the work done in joules and calories
*September 29, 2012*

**Math**

Larry has an annual return of $213.00 from $3000.00 invested at simple interest. One at 5% and the other at 8%. How much is invested at each rate. (Hint, Interest earned = amount invested x rate of interest.)
*September 10, 2012*

**algebra**

2ax+6bx+ay+3by-az-3bz
*September 1, 2012*

**finance**

Assume investors expect a 2.0% real rate of return over the next year. If inflation is expected to be 5.0%, what is the expected nominal rate dor one year US Treasury security?
*January 27, 2012*

**math**

YEH! 803.244.9672. you can call me
*December 29, 2011*

**math**

sorry.
*December 29, 2011*

**Boys**

guys are trouble. im staying single till im 19. she shoult do the same.
*December 29, 2011*

**world history**

Ms. Sue is correct. It is easy to do this yourself. All you need to know that with B.C.E. dates, the higher dates come before the lower dates. For example, 5th century B.C.E. is an earlir date than 3rd Century B.C.E.
*November 20, 2011*

**poetry**

It is about the author's imminent death and about all the things that he would have liked to achieve but never did.
*November 20, 2011*

**health**

The answer is B.
*November 20, 2011*

**math**

find the solution of (x2-y2)dx + 3xydy =0 Please help me to find the right answer,I sovled many ways but I don't get the right one with answer key. Thank you so much in advance
*November 18, 2011*

**5th grade math**

Ms. Sue is correct. All you do is multiply the number of boys by 2 and you have your answer.
*November 17, 2011*

**Englsih due at 10:30**

One of the secrets for proofreading any document is to read the sentences out loud. You will pick up many grammatical errors this way.
*November 16, 2011*

**math**

An empty glass jar weighing 1.54 kg is in the shape of a cylinder which has a radius of 14cm and a height of 20cm. Calculate how many litres of water it will hold when filled to the top.Also calculate its weight when it is filled with water (take pie=22/7)
*October 3, 2011*

**business**

A company has the following alternatives on some real estate that it needs for its new plant. It can lease the facility for $10,000 a month for 15 years, or it can buy the facility now for $800,000. The company’s weighted average cost of capital is 12% and payments are ...
*August 15, 2011*

**Algebra**

Thank you very much, I was beyond stumped.
*June 23, 2011*

**Algebra**

I can not figure these out for the life of me. Any help is appreciated. 1. Find the final amount of an investment if $2,000 is invested at an interest rate of 8% compounded quarterly for 8 years. I used interest formula and came up with $1,769.08. And then: I = .08/4 = .02 N...
*June 23, 2011*

**Algebra**

Thank you Reiny!
*June 20, 2011*

**Algebra**

Find the possible values of a, if the distance between the points is 5, and the coordinates are (1,1) and (4,a) I'm not quite sure how to do this one.. I've tried the distance and midpoint formula, but I'm confused. I don't what to do with the (a-1)^2 part. 5...
*June 20, 2011*

**chemistry**

calculate the potential of silver electrode in a contact with the following a/ solution that is 0.0150M in I2 and saturated with AgI b/solution that is 0.0040 M in CN- and 0.0600M in Ag(CN)2^-
*June 7, 2011*

**chem**

a mean = 0.5, and the standard deviation is 1.84*10^-3 ( gassian statistic apply). How many replicated if the standard error of the mean is not excess 0.001%. Please help, thank you so much
*April 22, 2011*

**Statistics**

Tuyns et al. (1977) carried out a case-control study of esophageal cancer in the region known as Ille-et-Vilaine in Brittany, France. The referring data set is oesoph_new.dta, and use logistic regression models to answer each of the following questions. For each question, ...
*April 16, 2011*

**sociology**

the book needs to be updated because the same question is from the same book that we read at Rasmussen. It's on page 365.
*December 3, 2010*

**English**

RADISH should be written as a plural in line with the other vegetables, i.e, RADISHES.
*November 17, 2010*

**CHEMISTRY..please help..thanks**

If a small stream of liquid A was strongly deflected by a charged object, liquid B was moderately deflected, and liquid C was weakly deflected rank the liquids in order of polarity. (Assume densities and charges are all equal.)
*November 2, 2010*

**Physics-Help!!! bobpursley can u check this again please???**

because there is PEnergy, i get the negative value do i can't take the root of it!!!
*October 28, 2010*

**Physics-bobpursley can u check this again please**

Its wrong again. is the value of d same as x??? I'm keep getting the wrong answers for both part a and b.
*October 28, 2010*

**Physics-bobpursley can u check this again please**

Q. A 10.6 kg weather rocket generates a thrust of 226.0 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 402.0 N/m, is anchored to the ground. Initially, before the engne is ignited, the rocket sits ...
*October 28, 2010*

**Physics**

I think i got it now.
*October 28, 2010*

**Physics**

Thank You bobpursley.
*October 28, 2010*

**Physics**

1. A force F = (3.99xi + 2.86yj) N acts on an object as it moves in the x direction from the origin to x = 4.45 m. Calculate the work done on the object by the force. Attemp: since we only consider x direction i multiplied 3.99 by 4.45 but it didnt work out. 2. A 10.6 kg ...
*October 28, 2010*

**how come no one is helping on physics questions!!!**

every physics helpers are not getting any responses. can someone help on physics questions pleases???
*October 28, 2010*

**college Physics**

Thank You!!!
*October 28, 2010*

**college Physics**

Q. A force F = (3.99xi + 2.86yj) N acts on an object as it moves in the x direction from the origin to x = 4.45 m. Calculate the work done on the object by the force. Attemp: since we only consider x direction i multiplied 3.99 by 4.45 but it didnt work out.
*October 28, 2010*

**college physics**

Thank You!!!
*October 28, 2010*

**college physics**

Q. A 10.6 kg weather rocket generates a thrust of 226.0 N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 402.0 N/m, is anchored to the ground. Initially, before the engne is ignited, the rocket sits ...
*October 28, 2010*

**physics**

Q. A person wants to shoot a rocket off of a mountain 3.26 km high so that the rocket, when shot at 31.3¡Æ above the horizontal from the very top of the mountain, lands at the foot of the mountain 9.37 km (horizontal distance) away. a) What initial speed must the ...
*October 17, 2010*

**Poop**

what's another word for poop?
*September 23, 2010*

**calculus**

Pretend the program in Senegal had been reducing infant mortality at a rate of 12.5 % per year. How long would it take for infant mortality to be reduced by 38 %?
*September 17, 2010*

**calculus**

Pretend the program in Senegal had been reducing infant mortality at a rate of 12.5 % per year. How long would it take for infant mortality to be reduced by 38 %?
*September 17, 2010*

**social studies**

I need to fill in 3 blanks to answer the questions what are nonrenewable resources and what are nonrenewable. my choices are oil plants, sun, wind and water For the nonrenewable resources I turned in my paper with oil and water but my teacher marked 1 point off because I left ...
*November 3, 2009*

**social studies**

Are wind, water, and sun all renewable rescource
*November 3, 2009*

**4thngrade**

THE SOUNDS OF NIGHT-TIME STOOD STILL AS THE WOLF HOWLED IN THE DISTANCE. THE SOUNDS OF NIGHT-TIME WARNED US OF DANGER APPROACHING.
*February 11, 2009*

**SCIENCE!!**

i have a question
*January 28, 2009*

**psy**

An important factor to consider in choosing your classes is how employers will view the skills you have developed during your college experience. How will you select classes in order to develop the skills employers expect? What other activities might you engage in during your ...
*December 15, 2008*

**Chemistry**

thanks, i meant pure substance because its one colour
*October 30, 2008*

**Chemistry**

a bottle of a soft drink looks pure, but it is not, how could you demonstrate that it is a mixture? thanks
*October 30, 2008*

**com 140**

well i thought that the digifast employees the new services that I'm trying to bring is a bank. This service will benefit the employee of the suite, by keeping them from having to go across town to get to one. During lunch time an employee might want to drive across town ...
*September 12, 2008*

**com 140**

can anyone help me I'm working on this final presentation and i have to do a powerpoint presentation but i am undecided on what i shoul include in in i'm currently workin on bringing a new business like a bank to the digifast suite what can i tell the employees how ...
*September 12, 2008*

**Economy**

Ok - thanks. I have the APA down. I am having trouble looking for a web site for articles that discuss the local, state, or federal taxation of a good.
*July 20, 2008*

**Economy**

Where do I get started with this? Write a 700- to 1,050-word paper in APA format describing the effects of taxation and price controls on the economy.
*July 20, 2008*

**Math**

4^-x=(1/256) I think the answer or I guess the answer I have is: 4^-x=16^-2
*April 9, 2008*

**Math**

Satellites in the global positioning system (gps) orbit is 12,500 miles above Earth. Gps signals can't travel through earth so a satellite at point b can transmit signals only to points on ac. How far must the satellites be able to transmit to reach points a and c. The ...
*March 25, 2008*

**Chemistry**

I need to predict the acid/base reactions of sodium carbonate with HCl, CH3COOH, NH3, and NaOH. I'm stuck, when I'm writing out the ions to find the strongest acid and base, does the NaHCO3 become Na and HCO3, or N, H, and CO3? Also, would these be polyproptic? NaHCO3...
*March 19, 2007*

**Chemistry**

The infrared spectrum of CH3CH2NH2 shows two absorptions not shown by bromoethane. Identify the bonds responsible for these absorptions. I'm a spectroscopist, but not a chemist. Here's my best guess. The CH3CH2NH2 has a NH2 group where a Br would be in bromoethane. The...
*January 12, 2007*

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