# Homework Help: College

**college chem**

calculate the amount of energy (in kj) necessary to convert 457 g of liquid water from 0 Celecius to water vapor at 167 celcius. the molar heat of vaporization (Hvap) of water is 40.79 jk/mol. the specific heat for water is 4.187 j/g celcius and for steam 1.99 j/mol celcius. (...

*Monday, February 4, 2013 by luis fernandez*

**college chem**

metallic iron crystallizes in a cubic lattice. The unit cell edge length is 287 pm. The density of iron is 7.87 g/cm^3. Calculate the mass (in grams) of one unit cell

*Monday, February 4, 2013 by luis fernandez*

**college chem**

europium crystallizes in a body-centered cubic cell (the Eu atoms occupy only lattice points). calculate the mass of the unit cells

*Monday, February 4, 2013 by luis fernandez*

**college chem**

calculate the amount of heat (in kj) required to convert 140.1 g of water to steam at 100c

*Monday, February 4, 2013 by luis fernandez*

**College Algebra**

I have a few problems I need help with and also do have multiple choice. If I can have an explanation of how to get the answer that would be great. 1. Use the discriminant to determine whether the given equation has two irrational roots, two rational roots, one repeated root, ...

*Monday, February 4, 2013 by Kristen*

**College Algebra help!!!**

I have to solve each equation using a u substitution and need help understanding how to do this. The first equation is: 1. x^2/3-2x^1/3-15=0 2. x+4=7 Squareroot x+4

*Monday, February 4, 2013 by Kristen*

**college chemistry**

How many grams would you weigh out to get 3.1 X 10-3 Moles of MgCl2?

*Monday, February 4, 2013 by Vicky*

**college mathematics**

Three people are to be selected at random, each will be given one gift card. There is one card from Home Depot,one from Best Buy and one from Red Lobster. The first person selected will get to choose between the two remaining cards. The third person selected gets the third ...

*Monday, February 4, 2013 by carol*

**PLEASE CHECK THESE ANSWERS AMERICAN GOV**

1. The nerve center of the American Presidency is (C) the President’s Cabinet. the Executive Office of the President. the Congressional houses. the Civil Service. 2. Presidential elections include all of the following except (D) participatory caucuses. primary elections. the...

*Sunday, February 3, 2013 by karen*

**statistics**

1. The scores on a standardized test for high school students are normally distributed with a population mean of 500 and a population standard deviation of 100. Use the empirical rule (0LI refers to this as the standard deviation rule.). Make sure you provide graphs for each ...

*Sunday, February 3, 2013 by lay*

**Community technical college**

Given that 1st term of an A.P is 7 and it's 10th term is twice the second term,calculate the (a) 19th term (b)sum of 28 terms (c) difference between 9th and 6th terms

*Sunday, February 3, 2013 by Benjamin*

**college algebra**

Find y when x=1/2, if y=3/2 when x=10 How do you work this?

*Saturday, February 2, 2013 by Anonymous*

**college general chemistry**

Calculate the volume of a rectangular solid with a thickness of 0.750 cm and an area of 8.25 cm2

*Saturday, February 2, 2013 by Amber*

**college algebra**

Direct variation Find y when x=5, if y=7 when x=14 I think the answer is 2.5 but don't know for sure:-)

*Saturday, February 2, 2013 by Anonymous*

**college algebra**

Slope intercept Vertical, passing (5,-1) Do you solve like this? M1= m/5-5m M=5

*Saturday, February 2, 2013 by Anonymous*

**college algebra**

Write slope-intercept equation Passing through the points (-6,-9) and (0,8) I think it's this just making sure: M=(8-(-9))/(0-(-6)) =17/6 Y= -17/6x+36/6 Y=-17/6x-6 M=17/6 and Y=-6

*Saturday, February 2, 2013 by Anonymous*

**Math**

A random sample of 42 college graduates revealed that they worked an average of 5.5 years on the job before being promoted. The sample standard deviation was 1.1 years. Using the .99 degree of confidence, what is the confidence interval for the population mean?

*Saturday, February 2, 2013 by Jim*

**basic college math**

write 14.825 as a faction

*Saturday, February 2, 2013 by Cindy*

**basic college math**

what is 4/13 written as a decimal?

*Saturday, February 2, 2013 by Cindy*

**College Algebra**

3x^4=648x someone help please im so confused. i am trying to find the solution set?

*Friday, February 1, 2013 by Adrianna*

**college chem**

A researcher explores the ideal gas equation. He measures the pressure of a system at different temperatures ( keeping the volume and moles of the gas constant) and creates a plot of P versus T. What is the slope of the line that results if the volume is 1.0L when 1.0 mol of ...

*Friday, February 1, 2013 by k*

**college algebrea**

(3x)/(x+2)=9-(6)/(x+2)

*Wednesday, January 30, 2013 by hang*

**penn foster**

im trying to finish these classes soon so i can start college, but honestly they are too complex. and i NEED HELP!!!! I have 1-5 done. 6. In the Mongol Empire, the plague A. provided new oppurtunities for territorial expansion B.ended further expansion C. had no effect, ...

*Wednesday, January 30, 2013 by katie*

**College Chemistry**

what might be the reason that this is happening: During a simple distillation i have 14ml or 50/50 hexane;toluene mixture in a 25mL round-bottom flask. However, by the time i collected 8ml of distillate there were no liquid left in the flask.

*Tuesday, January 29, 2013 by Anonymous*

**stats**

identify the independent and dependent variable A group of college students were given a short course in speed-reading. The instructor was curious if a monetary incentive would influence performance on a reading test taken at the end of the course. Half the students were ...

*Tuesday, January 29, 2013 by Anonymous*

**college algebra**

Identify where f increases and where f decreases. f(x)=5x+3 I think it's (3,5) increases and (3,-2) decreases?

*Tuesday, January 29, 2013 by debbie*

**Business English**

Which is recommended when including a career objective on the resume of a recent college graduate?

*Tuesday, January 29, 2013 by Anonymous*

**English**

I have to write a letter of intent to a college stating why I am a good fit for their journalism program. In the rough draft, I wrote this sentence: "I follow current events on a casual, weekly basis." How can I sound a little more dedicated to my approach in this statement?

*Tuesday, January 29, 2013 by Alex L.*

**college physics**

A cylindrical rod of cross-sectional area 5.0mm2 is made by joining a 0.30m rod of silver to a 0.12m rod of nickel. The silver end is maintained at 290K and the nickel end at 440K. given the thermal conductivities of silver and nickel are 0.42kWm-1K-1 and 91Wm-1K-1 ...

*Tuesday, January 29, 2013 by pins*

**biology college**

which leukocyte is predominant in the blodd smear?explain by comparing it with other leukocytes and red blood cells in the blood smea

*Tuesday, January 29, 2013 by izzat*

**college algebra**

Find the domain: h(x)=√(x+4) How do I work this problem?

*Tuesday, January 29, 2013 by debbie*

**College Algebra**

Hello I need help with this problem. I need to identify if the equation is identity, contradiction, or conditional equation. -(5x-3)+2x=11-4(x+2)

*Monday, January 28, 2013 by Kristen*

**College Chemistry**

How many moles of aluminum do 2.66×10^24 aluminum atoms constitute?

*Monday, January 28, 2013 by Kaycie*

**College Chemistry**

Upon decomposition, one sample of magnesium fluoride produced 1.66kg of magnesium and 2.56kg of fluorine. A second sample produced 1.25kg of magnesium.How much fluorine (in grams) did the second sample produce?

*Monday, January 28, 2013 by Kaycie*

**writing**

Edit mMath Autobiography Theresa V. Monteiro MAT 095 11:00 AM – 12:15 PM My name is Theresa and I am from Norwalk Connecticut. I’ve been living here for a year now. I moved to New London Connecticut to start my life. I’ve taken care of all my immediate family and put my ...

*Monday, January 28, 2013 by Theresa*

**college chemistry**

calculate the specific heat for 18.5-g sample of tin that absorbs 183 J when its temp increases from 35.0 degrees celcius to 78.6 degress celcius. I don't know where to even start, help?

*Monday, January 28, 2013 by dancechick123*

**College Algebra**

Solve for the specified variable in each formula or literal equation Sn=n(a1+an/2) for n (sequences)

*Sunday, January 27, 2013 by Kristen*

**College Algebra**

Hello I need help with this problem. I need to identify if the equation is identity, contradiction, or conditional equation. -(5x-3)+2x=11-4(x+2)

*Sunday, January 27, 2013 by Kristen*

**Statistics**

A college’s data about the incoming freshmen indicates that the mean of their high school GPAs was 3.4, with a standard deviation of 0.35; the distribution was roughly mound-shaped and only slightly skewed. The students are randomly assigned to freshman writing sem- inars in...

*Friday, January 25, 2013 by Lissa*

**College Math**

how to construct a truth table for q w/upside down v~p, using the following: P: this is an orange q: the monkey is tall

*Thursday, January 24, 2013 by Althea*

**college algebra**

From 1988 to 2008 average annual tuition and fees at public colleges increased from $525 to $5500. Calculate the percent change over this time period. How do I set this up and solve it? Thanks for your help:-)

*Thursday, January 24, 2013 by debbie*

**college algebra**

(9.87x10^6)(34x10^11) I got 3.3558e19 but I don't think its right

*Wednesday, January 23, 2013 by debbie*

**college algebra**

(9.87x10^6)(34x10^11) I got 3.3558e19 but I don't think its right

*Wednesday, January 23, 2013 by debbie*

**College Finite**

Assume that you have a total of 9 people on the committee: 2 black males, 1 black female, 1 white male, and 5 white females. Party rules require that at least one black and at least one female hold one of the three offices. In how many ways can the officers be chosen while ...

*Wednesday, January 23, 2013 by Emily*

**College Finite**

A student wants to buy 3 CDs, but assume that there are 3 CDs featuring the piano, 5 CDs featuring the trumpet, and 3 CDs featuring the saxophone. In how many ways can the selection be made if CD's featuring at least 2 different instruments are selected?

*Wednesday, January 23, 2013 by Emily*

**college chemistry**

if a cheetah runs 60 miles per hour how many milliseconds will it take to run 33 meters

*Wednesday, January 23, 2013 by Evelyn*

**college algebra**

13√9+16 |5-7|^2 I got 9.40 but I think I might have done it wrong

*Tuesday, January 22, 2013 by debbie*

**college algebra**

Find the center and radius of the circle (x+3)^2+(y-5)^2=13 I think the center is (-3,5) Radius is (13) but I don't know how to show the work for it.

*Tuesday, January 22, 2013 by debbie*

**College chemistry**

A farmer applies 13.50 kg of a fertilizer that contains 10.0% nitrogen to his fields each year. Fifteen (15.0%) percent of the fertilizer washes into a river that runs through the farm. If the river flows at an average rate of 0.265 cubic feet per second. What is the ...

*Tuesday, January 22, 2013 by Unknown*

**College Chemistry**

a mixture contains two crystalline solid X and Y. Decide if pure X can be obtained by a proper recrystallization using solvent A. Include the exact volumes of solvent used and the amount of pure X obtained. GIVEN: Solubility of X in boiling A :200mg/ml solubility of X at room ...

*Monday, January 21, 2013 by Anonymous*

**College Algebra**

How would figure out the slope and intercepts: 1.4x= -14y

*Monday, January 21, 2013 by Anonymous*

**MATHEMATICS**

Suppose you won a contest at 9th grade start that deposited $3,000 in an account that pays 5% annual interest compounded continuously. You go to college for four years (four years later). How much will you have then?

*Monday, January 21, 2013 by Chencho el chancho choncho*

**College Algebra**

The load L a horizontal beam can safely support varies jointly as the width w and the square of the depth d and inversely as the length l. If a 12-foot beam with width 6 inches and depth 8 inches safely supports 600 pounds, how many pounds can a 14-foot beam that has width 5.5...

*Monday, January 21, 2013 by Audrey*

**College Algebra**

The expression x^2-7 is not factorable using integer values. But the expression can be written in the form X^2-(Square root7)^2 enabling us to factor it as a “binomial” and its conjugate: (x+square root 7)(x-square root 7) Use this idea to factor the following expressions...

*Monday, January 21, 2013 by Krissy*

**College Algebra**

I'm wondering how to answer this. The conjugate of 2-Square root 3 is?

*Monday, January 21, 2013 by Krissy*

**College Algebra**

I need some help with a handful of questions. I need to see the steps on how to get to the final answers. I would also appreciate if you can explain how you got to those steps. Rationalize each expression by building perfect nth root factors for each denominator. Assume all ...

*Monday, January 21, 2013 by Krissy*

**math**

Twelve college students were surveyed about the distance from their house to the college they attended. 12 18 54 13 15 24 8 5 14 27 1 20 1. Using the data set above, find the percentile ranking for the data point 24. (is this 75th percentile? 2. Using the data set above, what ...

*Sunday, January 20, 2013 by anoneemose*

**statistics help please!**

Twelve college students were surveyed about the distance from their house to the college they attended. 12 18 54 13 15 24 8 5 14 27 1 20 1. Using the data set above, find the percentile ranking for the data point 24. (is this 75th percentile? 2. Using the data set above, what ...

*Sunday, January 20, 2013 by anoneemose*

**HELP PLEASE**

Twelve college students were surveyed about the distance from their house to the college they attended. 12 18 54 13 15 24 8 5 14 27 1 20 1. Using the data set above, find the percentile ranking for the data point 24. (is this 75th percentile? 2. Using the data set above, what ...

*Sunday, January 20, 2013 by anoneemose*

**College Algebra help please**

I need some help with a handful of questions. I need to see the steps on how to get to the final answers. I would also appreciate if you can explain how you got to those steps. Rationalize each expression by building perfect nth root factors for each denominator. Assume all ...

*Sunday, January 20, 2013 by Krissy*

**statistics**

Twelve college students were surveyed about the distance from their house to the college they attended. 12 18 54 13 15 24 8 5 14 27 1 20 1. Using the data set above, find the percentile ranking for the data point 24. 2. Using the data set above, what distance corresponds to ...

*Saturday, January 19, 2013 by anoneemose*

**college math**

divide 2x^2-8x19 byx-3

*Saturday, January 19, 2013 by susie*

**Math**

At a college basketball game, the ratio of the number of freshmen who attended to the number of juniors who attended was 3 to 4. The ratio of the number of juniors who attended to the number of seniors who attended was 7 to 6. What was the ratio of the freshman to the number ...

*Saturday, January 19, 2013 by Sarah*

**College Algebra**

I need some help with a handful of questions. I need to see the steps on how to get to the final answers. I would also appreciate if you can explain how you got to those steps. Rationalize each expression by building perfect nth root factors for each denominator. Assume all ...

*Saturday, January 19, 2013 by Krissy*

**Stadistics**

Select the most appropriate study design for each of the following questions. (Note: All study design options may not be used and each design option can be used more than once. 1. A study is done to examine the association between a mother’s education and risk of a ...

*Saturday, January 19, 2013 by Anonymous*

**anatomy**

Ineed to get better organized for college and family. I am only taking 7 credit hours but i find my self staying up late to study. I'm taking anatomy and psysiology along with math 098. Please give me advice on creating a study schedule. Thank you

*Friday, January 18, 2013 by #####rena*

**college chemistry**

A 0.300 g sample of an aspirin tablet is used to prepare 100.0 mL of a stock solution by dissolving the tablet in 1 M NaOH then diluting with distilled water to the 100 mL mark of a volumetric flask. A 0.30 mL sample of the stock solution is then transferred to a volumetric ...

*Thursday, January 17, 2013 by abbie*

**One college algebra ?**

Hello I have a question about a problem. The problem is (- 25/9)^3/2. Its multiple choice however I think they are tricking us. A. 125/27 B. - 125/27 C. 125/3 D. Not a real number I got A as an answer but feel that it is not a real number?

*Wednesday, January 16, 2013 by Kristen*

**economics**

Jesse and Kimberly recently graduated from college and are starting a family. Currently, they are just making ends meet with their $45,000 salary. They want to contribute the maximum amount (currently $2,000) to fully fund an Educational Savings Account when their baby is born...

*Wednesday, January 16, 2013 by john*

**College Algebra**

I posed these one's before but added parenthesis which I think made it confusing as the actually questions do not have them. So, I'm reposting them without to see if it makes sense. If not I understand. 1. Compute as indicated. Write your answer in lowest terms. a+3/a^2-4-a+5/...

*Wednesday, January 16, 2013 by Krissy*

**College Trigonometry**

From a point 200 yards from the foot of a building, the angle of elevation to the top of the building is 37 degrees. Find the measure of the angles of the triangle formed by the building, the ground, and the line of sight to the top of the building?

*Wednesday, January 16, 2013 by Marie*

**college algebra**

2a^2-3a=20 solve for a

*Tuesday, January 15, 2013 by Wanda*

**college algebra**

solve for x -4/3x-1<7

*Tuesday, January 15, 2013 by Wanda*

**college algebra**

(2x^3)^3/(-3x^5)^2

*Tuesday, January 15, 2013 by Wanda*

**College Algebra**

I posed these one's before but added parenthesis which I think made it confusing as the actually questions do not have them. So, I'm reposting them without to see if it makes sense. If not I understand. 1. Compute as indicated. Write your answer in lowest terms. a+3/a^2-4-a+5/...

*Tuesday, January 15, 2013 by Kristen*

**College Algebra**

Last one for today! Again would appreciate a breakdown on how to get to a resolution. It is multiple choice. 1. Simplify the expression using the quotient to a power property. (3y^6/z^7)^3 a. 27y^9/z^7 b. 3y^9/z^10 c. 27y^18/z^7 d. 27y^18/z^21 2. Use a descriptive variable and...

*Tuesday, January 15, 2013 by Krissy*

**College Algebra**

I have a few more questions that I'm not understanding. Its multiple choice however I would appreciate a breakdown on how to solve. 4.Simplify the compound rational expression. Use either method. 1+(5/y-10)/y+(25/y-10) a. 1/y-5 b. 1/y+5 c. 6/y+25 d. 1/y+1/5 5.Simplify the ...

*Tuesday, January 15, 2013 by Krissy*

**College Algebra**

I have a few more questions that I'm not understanding. Its multiple choice however I would appreciate a breakdown on how to solve. 1.Evaluate without a calculator, using the order of operations. -2^2+20-|8-20|-squareroot of 64 a. -36 b. 4 c. 28 d. -4 2.Simplify the expression...

*Tuesday, January 15, 2013 by Krissy*

**College Algebra**

I need some help with a few problems. They are multiple choice but need a breakdown on how I can work the problems. Thanks for your help! 1. Factor the trinomial completely. 10x^2 + 11x-6 a. (2x+3)(5x-2) b. (2x-3)(5x+2) c. (10x+3)(x-2) d. (2x+1)(5x-6) 2. Compute as indicated. ...

*Tuesday, January 15, 2013 by Kristen*

**statistics**

Select the most appropriate study design for each of the following questions. (Note: All study design options may not be used and each design option can be used more than once. 1. A study is done to examine the association between a mother’s education and risk of a ...

*Tuesday, January 15, 2013 by jhikjhak*

**math**

Julia and Bianca both leave the college at the same time, but in opposite directions. If Bianca travels 9 mph faster than Julia and after 4 hours they are 140 miles apart, how fast is each traveling?

*Monday, January 14, 2013 by mathew*

**College Algebra**

I need help factoring a problem and cant seem to get it right. The one I'm stumped on is 2x^2+7x+2. I have to compute as indicated and write final in the lowest terms. The whole problem is x^2-7x-18/x^2-6x-27*2x^2+7x+2/2x^2+5x+2

*Sunday, January 13, 2013 by Kristen*

**college algebra**

What are the zeroes of f(x) = 2x^2 -3x + 1

*Saturday, January 12, 2013 by Sydney*

**College Physics**

The masses of the earth and moon are 5.98 × 1024 and 7.35 × 1022 kg, respectively. Identical amounts of charge are placed on each body, such that the net force (gravitational plus electrical) on each is zero. What is the magnitude of the charge placed on each body?

*Thursday, January 10, 2013 by Anonymous*

**College Algebra**

Write the equation of the circle in standard form. Find the center, radius, intercepts and graph the circle. x^2+y^2+14x+18y=-81

*Thursday, January 10, 2013 by Amary*

**Math For College Readiness**

Simplify the Complex Fractions 1. 8a / 3b^2 / 6ab /5 2. 42x^2 + 14x / x - 7 / 2 + 6x / 21 - 3x 3. 9 + 3 / x / x / 4 + 1 /12 4. (x^-1 + x^-2)divided by (9x^-2) Ans. #1: 20 / 9 Ans. #2: 42x^2 + 6x + 4 / -2x + 14 Ans. #3: 144 / x / 3x + 1 I don't know how to do #4

*Wednesday, January 9, 2013 by Neil*

**College English**

Describe how communication is a two-way process and explain why communication skills are paired.

*Tuesday, January 8, 2013 by Cindy*

**English-writeteacher**

Apologies for the re-post but it didn't seem like my last post would be answered. I'm writing a short story for english based on the painting Nighthawks and I would really like some feedback. Any type of feedback would be highly appreciated. I'm kind of stuck. Thanks in ...

*Monday, January 7, 2013 by Rose*

**English III short story**

I'm writing a short story for english based on the painting Nighthawks and I would really like some feedback. I'm kind of stuck. Thanks in advance! The Job They were just names. Just two insignificant names in the little black book, just like all the rest. Targets. Forty ...

*Monday, January 7, 2013 by Rose*

**college algebra**

let f(x) be polynomial function. explain how to use the factor theorem to check if x) is a factor of F(x)

*Friday, January 4, 2013 by maria*

**For Kristy - re Hamlet**

http://www.jiskha.com/display.cgi?id=1357147928 and http://satomko.hubpages.com/hub/Fortinbras-as-a-Foil-for-Hamlet Do. Not. Plagiarize. If you are not clear on what plagiarism is and how NOT to plagiarize from a source, read through this entire webpage from ...

*Thursday, January 3, 2013 by Writeacher*

**College**

Difference between analytical and other instrumentation ? I want atleast 10points

*Tuesday, January 1, 2013 by Simran kaur*

**College**

Tmrw my exm plz give me soon reply ,about Measurment of viscosity and viscosity.

*Tuesday, January 1, 2013 by Simran kaur*

**Asworth college**

which of the sentences uses modifiers correctly? a. Kurt and his hockey teamm ates nearly cooked two hundred pancakes for the breakfast fundraising event. b. Rudolph enjoys eating curries from the indian delicatessen with a lot of spices. C. on the phone the telemarketer ...

*Tuesday, January 1, 2013 by Rochelle*

**English - Personal Statement**

How do you write a good personal statement for acceptance? (Any topic). I drafted, but I did not know what to write about, so I just wrote about my sister :/ My sister and I are not alike in any way, we do not even share the same blood. Growing up though, I was always in her ...

*Sunday, December 30, 2012 by Marie*

**college algebra**

Solve the following inequality. x^3+9x^2-108 less or equal to 0. Then write your solution in interval notation. I am sooo confused and do not have any idea how to do this. Can someone please show me step by step please??? Thanks in advance. Someone who is confused.

*Tuesday, December 25, 2012 by allison-please help!!!*

**Math**

From a survey of 200 college students, a marketing research company found that 130 students owned iPhones, 70 owned cars, and 60 owned both cars and iPhones. (a) How many students owned either a car or an iPhone (but not both)? _______students (b) How many students do not own ...

*Sunday, December 23, 2012 by Brian*

**Darton College**

Explain how the process of combining radicals through addition and subtraction is similar to combining polynomials. What make two radicals like radicals

*Friday, December 21, 2012 by Standford*

**College Algebra**

Why is t= ln(2)/.04 the same as t= 25ln(2)? Please explain it step by step. What rule do you use or how do you change the .04 to the 25?

*Friday, December 21, 2012 by Linda*

**College Algebra**

I have t = ln(2)/.04 and the book has the answer as 25ln(2) I know these are the same but please show me the steps to go from ln(20)/.04 to 25ln(2) What rules etc. make it so I can do that so I can do it on later problems Thank you

*Thursday, December 20, 2012 by Linda*