1. CHEM 101 (edited)

    Calculate ΔHrxn for the following reaction: CaO(s)+CO2(g)→CaCO3(s) Use the following reactions and given ΔH values: Ca(s)+CO2(g)+1/2O2(g)→CaCO3(s), ΔH= -812.8 kJ 2Ca(s)+O2(g)→2CaO(s), ΔH= -1269.8 kJ I have literally tried everything and I don't
  2. Algebra

    I am having such a hard time in this class. Hopefully someone here can help me to understand some of what they are trying to teach me. I have a problem here and have been working on it for about an hour now and I can not figure it out. I need to come up
  3. Math

    Translate and simplify "six less than twice the sum Of a number and three. I was not sure how to set it up Is it 2(x+3)-6 Or would it be set up 2x+3-6 I can solve it once I know how to set up the equation. Confused. Thanks for your help
  4. algebra

    3 numbers are in the ratio 3:5:7. if the larger number is multiplied by 3, the result is 26 more then the sum of the first and second numbers. Use an algebric solution to find the numbers
  5. language arts

    30-day Money Back Guarantee Our Groom Co. electric shavers come with a 30-day money back guarantee because we are focused on ensuring your satisfaction. The only stipulation is that you use your new shaver exclusively for 2 weeks to become accustomed with
  6. history

    What was the significance of the Mexican-American War? ( choose all that apply.) (2 points) A. Land ceded as a result of the war helped complete U.S. continental expansion B. Mexicans were often sold as slaves accelerating the slavery debate. *** C. New
  7. Entrepreneurship

    1. After you have put a marketing plan in place, it is important to do what? A) Monitor the results. B) Increase the price. C) Reduce your advertising. D) Segment the market. Is the answer A? 2. Using advertising to promote a company instead of a product
  8. Chemistry

    Hi I'm doing a research paper on the PH of skin and was wondering if you could answer even a few of these questions. I am in high school. Thanks. what does ph have to do with skin? how would using alkaline products affect skin? what are some symptoms
  9. english

    suki and lee wake up earl this morning . They want to go to grandma's house in the city.first they put on their clothes,then they ate their breakfast.they will ride with their parents in the car to grandma's house.they will take for her some food to eat.
  10. Chemistry

    Please can you assist me with the following problem I am totally muddled - I could swear I've never even heard of science!!! H2SO4(aq) ---> 2H+(aq)+(SO4^2-)(aq) A 0.21 g sample of sulfuric acid is dissolved completely in sufficient water to make 0.25
  11. US History~

    For the Dollar Diplomacy: Taft I don't get what the key policies would be. It wouldn't be sending US troops to Nicaragua to offer loans? Now, I'm confused all over again. I looked up what policy was: Basic principles by which a government is guided.

    What does Linda mean when she said “attention must be paid” to Willy Since I don't know the specific context of that statement within the book, I can't really answer your question. What happened just before she made this statement? This might give you
  13. Chemistry s103 Q5

    struggling to get this to come out right: Compound 1 CH2=CH-CH-OH | CH3 + Compound 2 O || CH3-CH-CH2-C | OH | | ? (i) identify any functional groups in compounds 1 & 2 by circling them and naming them clearly. (ii) complete the equation for reaction 1 by
  14. Finance

    Innovation Company is thinking about marketing a new software product. Upfront cost to market and develop the product are $5 million. The product is expected to generate profits of $1 million per year for 10 years. The company will have to provide product
  15. math

    Could someone double check my answers. 1. Write the number in expanded form 684 answer: (6x100)+(8x10)+(4x1) 2.Give the place value for the indicated digit 8 in the number 138,350 answer: thousands 3. Write the following in the standard form of a number
  16. math

    Rewrite the equation so that y is a function of x: 1. 2/3y+4=2x 2. 1/2(y+5)+4x=3x 3. Use the result in Ex. 1 to find y when x= -1, 0, and 2. 4. Use the result in Ex. 2 to find y when x= -1, 0, and 2. Thank you very much for any help.
  17. Algebra

    42. Which number best represents this set of data: 5, 5, 5, 6, 5, 5, 5, 6, 200? a. mean b. median I don't really understand this question but I'm guessing it's B.. 46. After flipping 13 consecutive "heads" on a fair coin, what is the probability of
  18. CHM

    Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high, too low or unaffected? Explain. Please someone explain this to me I don't
  19. Physics

    I need help figuring this out. I am asked to write about similarities of two different ways of determining the value of g. One of them is using the slope of the line, and one of them is using the average. Each method used the same L and T values.
  20. Physics

    What is the maximum acceleration of a platform that oscillates with an amplitude of 2.1 cm at a frequency of 6.7 Hz? I feel like this is a very simple question, but I'm having trouble figuring it out.
  21. 6th grade, social studies

    I am having some problems figuring out this question.... How does using the five themes help geographers understand the places they study?
  22. Chemistry

    List the sets of quantum numbers which describe all of the electrons possible in a 6p wave function (orbital): I'm really having trouble figuring this out!
  23. science

    need to make a silent proof box 15,000 cubic centimeters. What is the dimensions? I am having a hard time figuring it out.
  24. English

    I need to write a Reading Response to "Why We Crave Horror Movies" by Stephen King. I need help figuring out the theme to the essay.
  25. Math-- Fractions-- I Desperately Need Help!!

    I need help with this problem. Estimate 16 20/21 times 28 3/7 minus 4 13/25 plus 8 2/47 as a whole number or as a mixed number where the fractional part is 1/2 (Possible answers) One is the correct answer. A. 452 B. 480 C. 488 D. 492 1/2 I have tried to
  26. check+ math!

    QUESTION: A horizontal translation is applied to the graph of y= X^ 3 + 2 so that it will pass through (3, 10) what is the new equation for the graph? y=(x+a) ^3+ 2 10= (3+ a) ^3 + 2 10-2= (3+ a) ^3 + 2-2 8= (3+ a) ^3 Take the cube root of each side... 2=
  27. THE METAPHYSICAL CLUB by Louis Menand

    I'm taking AP US History so I have a summer assignment. I'm supposed to read The Metaphysical Cub by Louis Menand and write a 4-6 page essay on how the ideas of the past (written about in this book_ effect us today... If anyone has read this book, could
  28. Math

    Here is the math problem. 150 is 75% of what number? I know the rate is 75 percent and the base is 150. I am looking for the amount. My questions is how to find the answer? Do I divide? Okay maybe I am missing a huge section as to finding the answer to
  29. English

    I have a few more doubts. Thank you. 1) I keep fit by doing exercise every day. 2) What are you playing at? (How would you rephrase it?) 3) He is making breakfast on his own/by himself/alone (Do they have the same meaning?) 4) Get moving ! I'm on my way.
  30. chemistry...weird question

    on heatin, 0.02mol of the element M reacts with 0.025mol of oxygen gas. What is the empirical formula of the oxide of M? The mole ratio is .025/.02=1.25 or 5/4 So the O2 has a ratio of 5 to one Metal. M4 (O2)5= M>sub>4O10 or writing it in lowest
  31. Income tax / Accounting

    Computation of taxable income: The following information for 2009 relates to Tom, a single taxpayer, age 18. Salary $1,800 Intrest income $1,600 Itemized deductions $ 600 A. Compute Tom's taxable income assuming he is self-supporting B. Compute Toms's
  32. ACC233- INCOME TAX

    Computation of taxable income: The following information for 2009 relates to Tom, a single taxpayer, age 18. Salary $1,800 Intrest income $1,600 Itemized deductions $ 600 A. Compute Tom's taxable income assuming he is self-supporting B. Compute Toms's
  33. computer science

    How would you write this program? We are using Java in Netbeans IDE.. Write a program to enter the year (ex 2004) and month number (1-12) then compute the number of days in that month. Example Enter the Year: 2004 Enter the Month: 2 There are 29 days in
  34. history

    financing the war with borrowed money was an example of a. the cost-plus system b. deficit spending c. the Gross National Product d. wartime conversion the only two i could find in my book are B and C, and i don't think they are the answers...so its
  35. Math

    Using the terms factor,divisor,multiple,product,and divisible write as many statements about 6x8=48. My son is in learning support and has this problem and I don't know how to help him I am not good at math. Thank you for any assistance. Tyrone's mom
  36. Chemistry

    I conducted the synthesis of an Alum experiment in my lab last week and I'm working on my report. I'm almost done expect I don't know how one could increase the yield of the product (alum crystal)? And also what is the point of adding sulfuric acid? Can
  37. algebra

    When 40 is added to the number of miles Karen ran last week, the result is the same as adding 10 to 4 times the number of miles she ran last week. How many miles did Karen run last week?
  38. math

    Does anyone know how to explain mean, median, mode and range mean?? mean-the average of a group of numbers median-the number that is in the middle in an in order group of numbers mode-most common number in a group of numbers range- the difference or
  39. Math

    Can someone check a few answers for me? Thank you. 1. Simplify. (-14x^3) / (x^3) - (5x^4) = -14/1-5x Where x is not equal to 1/5, 0 2. Simplify. x - 2 / (x^2) + (4x) - 12 = 1/x+6 Where x is not equal to -6
  40. math

    Simplify 6P2 A.30**** B.15 C.12 D.720 Simplify 8c5 A.6,720 B.336 C.56**** D.10
  41. algebra

    Simplify x / 6x - x^2 Please show me how you did it so i can understand! Another one, Simplify x^2 - 3x - 18 / x + 3 This is a fraction Another one, k + 3 / 4k - 2 (this is a fraction) * 12k^2 + 2k - 4)
  42. 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
  43. History

    During the Continental Congress, two plans were put forth to create a design for Congress. Which of the following best describes how Congress would be designed, according to the New Jersey Plan? A.)There would be one house, and representatives would be
  44. Brave New World

    Have any f you read "Brave New World?" If so, I would appreciate if you could give me a thesis, or rather a main idea that i could use for my essay. I am thinking of writing about how Huxley uses new vocabulary and how words have taken a new meaning.
  45. Math

    what is the math rule if u put in 1 and get 15, put in 2 and get 13, put in 3 and get 11, put in 4 and get 9, and put in 5 and get 7
  46. math

    The formula for the lateral surface area of a cone is A=πr√(h^2+r^2). (A)Solve for r and simplify the result, if possible. (B) If the lateral surface area of a cone is 10 square feet and the height is 16 inches, what is the radius of the cone in inches?
  47. algebra

    I am thinking of a three digit number. It is am odd multiple of three, and the product of its digits is 24. It is larger than 275. What are all the numbers I could be thinking of? need help thank you
  48. math algebra

    Find 3 consecutive odd numbers where the product of the smaller two numbers is 34 less than the square of the largest number.
  49. Math

    Find 3 consecutive positive integers whose product is 5 more than the cube of the middle number. Tried x*(x+1)*(x+2) = (x+1)^3 + 5, but that solves to x = -6 which isn't positive.
  50. 6th grade math

    i have to make a conjecture on if there is more or less than 50 numbers that can be written as product of 3 digit numbers w/o using the number 1 more than once as a factor. Example: 10 can be 1*2*5 and 24 can be 2*3*4
  51. 6th grade math

    Can't figure this math problem out: Write an algebraic expression for the product of five less than a number and three, less eight, is twenty-eight. HELP ME PLEASE!!
  52. chemistry

    I need to know how to figure this out, step by step... Don't assume I know anything.. Break it down for me like I'm a 5 year old... I'm really horrible at figuring out where to even begin... what steps to use.. etc.. Thank you!!
  53. statistics

    The probability is 0.7 that a person shopping at a certain store spend less than $20.00. For groups size of 22, find the mean number who spend less than $20.00 Do they tell you the most probable amount spent? There are an infinite number of combinations of
  54. programming

    I am supposed to make a pseudocode for a fat gram calculator and I want to know if my code is correct. This is the instructions: Design a program that asks for the number of fat grams and calories in a food item. Validate the input as follows: - Make sure
  55. Is My Pseudocode Correct? - Programming

    I am supposed to make a pseudocode for a fat gram calculator. These are the instructions: Design a program that asks for the number of fat grams and calories in a food item. Validate the input as follows: - Make sure the number of fat grams and calories
  56. matlab

    Please help. I've made the variable for in_vector, but I'm having trouble figuring out how to get the vector to return a row vector of num_or_digits of length 10. Write a script that takes a vector of single-digit integers and counts the occurrences of
  57. Math

    For Exercises 1–10, write each ratio as a fraction in simplest form. Then explain its meaning. 1. 3 sailboats to 6 fan boats 2. 4 tulips to 6 daffodils 3. 5 ducks to 30 geese 4. 5 baseballs to 25 softballs 5. 6 poodles to 18 beagles 6. 10 brown eggs to
  58. math

    can someone help me with these math question?? Please? I would appreciate any help! Simplify #1 through 3. 1. 20/2 – 3^2 – (-2)^2 a. -3 b. 5 c. 16 d. 24 2. 3(x – 5) – (x + 2) a. 2x – 13 b. 3x – 13 c. 2x – 3 d. 2x – 17 3. (¾) / (2/5) a.
  59. Sign Language

    Which of the following would be considered a late deadened individual? a person born hearing who became Deaf as a teenager*** a person born Hearing who becomes Deaf at age 1 a person born Deaf who learns sign language later in life a person born deaf who
  60. physics

    Two cars are approaching a perpendicular intersection without a stop sign. Car 1 has a mass 900 kg and is heading north and car 2 has mass 900 kg and is heading west. The two cars collide at the intersection, and stick together as a result of the
  61. Applied Chemistry - HELP!

    Make a poster of types of product warning labels. I'm having a hard time looking up types of product warning labels. Please help and please do not just give me Google link to product label for me to look up by myself which I did but I .... having a hard
  62. Algebra

    - 20> 8 +7a Solve inequalities like you would an equation, EXCEPT if you multiply or divide by a negative number, reverse the inequality sign. Let's look at your problem: - 20 > 8 + 7a First subtract 8 from both sides (whatever operation you do to
  63. Algebra

    3(square root of)18 + square root of 2. How would I solve this problem, preferably making the numbers after the square root sign the same? P.S: Is there a way to do the square root sign on the computer?
  64. Mathematics

    How do I do these? 1. Simplify using only positive exponents: (2t)⁻⁶ 2. Simplify using only positive exponents: (w⁻²j⁻⁴)⁻³(j⁷j³) 3. Simplify using only positive exponents: a²b⁻⁷c⁴ ---------- a⁵b³c⁻² 4. Evaluate the expression
  65. math

    First estimate answer then divide to find exact answer. Simplify all answers. 2 2/3 divided by 10 2/3 I don't understand how to estimate the answer.
  66. college algebra

    Write expression as one logarithm and simplify if appropriate. log 3√x + log x^4 - log x^3 4 log (x+3) - 5 log (x^2+4) + 1/3 log y I have these who problems but I don't know where to start. HELP Please.
  67. Fundamental Cornerstones of Managerial accounting

    Green Enterprises produces small engines for lawn mowers. during the year, 110,000 engines were produced. The actual labor used was 60,000 hours at $9.50 per hour. Green has the following labor standard: 0.5 hour at $10 1. compute the labor rate variance.
  68. Statistics in Psychology

    Please help me with both of these questions. THANK YOU in advance for your for you help. 13. For the data, 9 5 10 7 9 10 11 8 12 7 6 9 (a) Compute the z-score for the raw score of 10. (b) Compute the z-score for the raw score of 6. 14. For the data in
  69. Math

    ∛(y^13) ∛(16y^14)Multiply and simplify assume all expressions under radicals represent non negative number My friend helped me she said azanswer is 12(y^13)(square root sybol y)
  70. science(chem)

    I synthesized Nylon in my lab for organic chem. I need help figuring out the theoretical yield so I can compare it to my product that I synthesized. I looked up the reaction online on Google by typing in "Synthesis of adipoyl chloride and nylon 6.6." I
  71. statistics

    I am having trouble knowing if I add or multiply with this problem: Male Female Age 19 and under 4746 4517 Age 20 1625 1553 Age 21 1679 1627 Choose one driver at random. Find the probability that the driver is Male and 19 or under. Now, do I find the
  72. English

    Use context clues to determine the meaning of the bolded word in the sentence below. Her enormous job responsibilities PRECLUDE the option of a vacation this summer. A.) made impossible in advance************ B.) specified in advance C.) were in harmony
  73. English

    1. We usually take them to the hospital using an ambulance. 2. We usually take them to the hospital as/while we use an ambulance. 3. We usually take them to the hospital which use an ambulance. 4. We usually take them to the hospital, using an ambulance.
  74. Probability and Statistics

    According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green. You randomly select peanut M&M’s from an extra-large bag looking for an orange
  75. Microeconomics

    Using the information below answer the following questions. If demand is :Qd = 400.00 - 15.00P and Supply is: Qs = 50.00 + 15.00P Where: Qd = quantity of the good demanded. Qs = quantity of the good supplied. P = price of the good. Part 1: The equilibrium
  76. math

    The queen asked her cook how many guests had attended a recent banquet. “I do not know, my lady” he said, “but every two guests shared a plate of fruit between them, every three used a bowl of broth among them, and every four shared a platter of
  77. Python programming

    1,000 students took an online course. 1/4th of them were from Africa, 1/4th from Europe , 1/4th from South America, and 1/4th from Asia. At the end of the course, the instructor observed that of the top 100 grades, 30 belonged to students from a single
  78. economic

    Suppose that your firm was accused of illegally conspiring with other sellers to act as a monopolist. In searching for an expert witness, you discover one economist who has calculate the cross elasticity of demand for your industry's product to be+2.05,
  79. business studies

    c----of p---- is the different stages that a product has to pass through before they are sold g----d----p-----is the total value of goods and services produced b a country in a year The first one looks like cycle of production, but I'm not sure about it.
  80. English

    1. I go to bed early on Saturdays. 2. I don't go to bed early on Saturdays. 3. I don't go to bed early every Saturday. 4. I sometimes go to bed on Saturday, and I sometimes don't go to bed on Saturday. 5. On Saturday, I never go to bed early.
  81. Algebra

    Determine all pairs (m, n) of a two-digit natural number m and a single-digit natural number n satisfying the following conditions. 1) If the number n is given as the number between the two digits of the number m, then a three-digit number is obtained
  82. Math

    Determine all pairs (m, n) of a two-digit natural number m and a single-digit natural number n satisfying the following conditions. 1) If the number n is given as the number between the two digits of the number m, then a three-digit number is obtained
  83. Science 8

    I need help on this portfolio project, I have to do a lab report on light refraction. The research question is "How does change in medium affect light?" and I need to make a hypothesis, but I don't know what to put.
  84. Maths

    Hi there, I'm currently stuck on a maths question. Find the limit as x approaches 0 for (1+sinx)^cotx I've put logs on both sides and am attempting to use hopitals rule but don't know where to proceed from here.
  85. english

    How would I correct the following sentence, I don't know if I have to put quotes for the poem or the movie: As I was reading Crossing Brooklyn Ferry, I noticed parallels between it and the movie Finding Nemo.
  86. Math (Check Answers Please)

    (Please tell me if I did a good job!) Write an equation with a variable on both sides of the equal sign that has infinitely many solutions. Solve the equation and explain why it has an infinite number of solutions. (My answer:) 3x + 5 = 3x + 5 This
  87. Stats: Joint Density Function

    Let the joint density function of X and Ybe given by: f(x)={kxy^2 for 0<x<y<1 (0 otherwise what is the value of k? Can someone please help me with this? The formula I used was: ))kxy^2 dx dy (where )) is double integration both from 0 to 1). I
  88. english

    Even as mankind evolved from Neanderthals to humans, It has never officially withdrew its inherent selfish predatory trait. Evolution has taught mankind an evil lesson: “Survival of the fittest”. Likewise, in the text George shoots Lennie not only as
  89. Language Arts Help!

    1. In which sentence does the prepositional phrase act as an adjective? A. In the morning, we rested in bed. B. We bought the cookies in the red package. C. During the day, Peter playes with the cat. D. My sister is good at dancing. 2. Which expression
  90. College Calc

    Problem: y=sqrtx ^1/x. Find DY/DX. ln(f(x))=lnx^1/2x or lnx to the 1/2x 1/2x lnx product rule (1/4x^2)(lnx)+(1/x)(1/2x) is the product rule correct? What do i do after this product rule?
  91. MATH

    In the top row of an 8*8 chessboard, Tom writes the values 1, 2, 4, 8, 16, 32, 64, 128. In the leftmost column, Tom writes the values 1, 3, 9, 27, 81, 243, 729, 2187. In every other square that doesn't have a number yet, Tom writes the product of the
  92. statistics

    a companys ceo wanted to estimate the percentage of defective product per shipment. in a sample contianing 600 products he found 45 defective product. a. find 99% confidence interval for the true porporton of defective product show calcultions and explain
  93. math dealing with varibles

    solve this problem S-46=14 is it... a)34 b)31 c)32 d)none of the above do you know how to solve for S? You want all of the variables (in this case S) on one side and the numbers on the other. We have S on the left side; we leave it there. We need to move
  94. Math

    We all need help on this. The population of a town is modelled by P=-0.1x^2+1.2x+4.4 where x is the number of years since the year 2000, and y is the population in thousands.  a) In the year 2005, what is the population?  I used the equation, put x=5 and
  95. Math

    The population of a town is modelled by P=-0.1x^2+1.2x+4.4 where x is the number of years since the year 2000, and y is the population in thousands. a) In the year 2005, what is the population? I used the equation, put x=5 and I got 7900 as the
  96. Math

    I just wanted to double check that I am correct. Answer is in Interval Notation. 1. Solve: |x|<7 Work: -7>x<7 Answer: (-7,7) 2. Solve: |x|>_ 7 Work: -7<_ x >_ 7 Answer: ( - infinity sign, -7] U [7, infinity sign)
  97. Economics

    Which of the following firms caould raise prices and expect an increase in revenues? A)a firm product has an elasticity of 1 B)a firm whose product has an elasticity of 0.31 C)a firm whose product has an elasticity of 3.1 D)all firms regardless of the
  98. Physics

    Hey, I'm a bit stuck on this question. "It has been observed that a certain star (S2) in the Sagittarius A* (meaning in the direction of the constellation Sagittarius) is orbiting a supermassive black hole. If the period of S2 is 16year and the distance
  99. English

    We have to give presentations on syntax. I remember awhile back reading this modernist poem which repeated the same sentence over 20 times but changed the order of words each time resulting in a different meaning. I think it really demonstrates the
  100. Chemistry

    Benzene reacts with hot concentrated nitric acid dissolved in sulfuric acid to give chiefly nitrobenzene, C6H5NO2. A by-product is often obtained, which consists of 42.86% C, 2.40% H, and 16.67% N (by mass). The boiling point of a solution of 5.5 g of the