Questions Asked on
April 14, 2014

  1. English

    1. Imagine you are writing a research paper on social networking sites. Which of the following thesis statements would be the most effective? A. Social networking sites have become incredibly popular in recent years and have millions of members. Many of

    asked by Cassie
  2. General Chemistry

    The problem is: Calculate the standard free-energy change for the following reaction at 25 degrees Celsius. 2Au^+3(aq) + 3Cr(s)-> 2Au(s) + 3Cr^+2(aq) I worked it out, getting half reaction: Au^3+ + 3e- -> Au; E = 1.498 Cr^3+ + 3e- -> Cr; E = -0.74 Ecell =

    asked by Tiffany
  3. English

    Several __________ were left on their desks in the classroom during recess. A. students book's B. students' books C. students books' D. student's books B

    asked by Angela
  4. Chemistry

    A voltaic cell utilizes the following reaction: 2Fe3+(aq)+H2(g)→2Fe2+(aq)+2H+(aq). What is the emf for this cell when [Fe3+]= 3.70M , PH2= 0.95atm , [Fe2+]= 7.0×10−4M , and the pH in both compartments is 4.05? Express your answer using two significant

    asked by Rebecca
  5. Chemistry

    Given the following half-reactions and associated standard reduction potentials: AuBr−4(aq)+3e−→Au(s)+4Br−(aq) E∘red=−0.858V Eu3+(aq)+e−→Eu2+(aq) E∘red=−0.43V IO−(aq)+H2O(l)+2e−→I−(aq)+2OH−(aq) E∘red=+0.49V

    asked by Rebecca
  6. Check English Answers

    Please check my answers: 1)pathos 2)thesis statements 3)Lincoln promises retribution for war 4)Ethos 5)Theme 1)"On the occasion corresponding to this four years ago all thoughts were anxiously directed to an impending civil war. All dreaded it, all sought

    asked by AMK
  7. Chemistry

    Vinegar is a solution of acetic acid, CH3COOH, dissolved in water. A 4.69 g sample of vinegar was neutralized by 32.97 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

    asked by Chris
  8. Math

    Based on a preliminary report by a geological survey team, it is estimated that a newly discovered oil field can be expected to produce oil at the rate of R(t) = 300t^2/(t^3 + 32)+5 (0 ≤ t ≤ 20) thousand barrels/year, t years after production begins.

    asked by Vanessa
  9. Mean, Median and Mode HELP!

    Find the mean median and mode of the data set: 10 11 4 7 12 11 16 6 9 15

    asked by Kirky
  10. chem 101

    How many kilojoules of heat are needed to completely vaporize 42.8 g of C4H10O at its boiling point? Given Hvap=26.5kj/mol

    asked by kim
  11. English III

    1)“We have appealed to their native justice and magnanimity, and we have conjured them by the ties of our common kindred to disavow these usurpations, which, would inevitably interrupt our connections and correspondence.” These lines from the

    asked by AMK
  12. English

    Which of the following is a compound sentence? A. After it began to rain, he could not find his umbrella. B. They met after work for a game of tennis. C. She liked her neighbors, but she rarely saw them. D. The afternoon meeting extended into the evening

    asked by Angela
  13. English

    Juanita sent the two __________ reports to __________ yesterday afternoon. A. technicians'; headquarters B. technicians; headquarter's C. technician's; headquarters' D. technicians'; headquarters' A

    asked by Angela
  14. Chemistry

    A 0.170-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant (Kf) of Co(NH3)62 is 5.0× 1031 M–6. I don't really know how to start. At first I thought about

    asked by Alexis
  15. science

    In the formation of the solar system nearly all of the mass of the solar nebula became ? Answer Are Terrestrial planets GAS giant SUN OORT CLOUD THANK YOU

    asked by snow
  16. English

    The main purpose of a transition is to: A. conclude a thought. B. indicate doubt. C. add emphasis. D. link ideas. D

    asked by Angela
  17. English

    Choose the version of the sentence below that has correctly placed modifiers. A. Coughing and sputtering, Alan steered the old car to the side of the road. B. The old car was coughing and sputtering as Alan steered it to the side of the road. C. The car

    asked by Angela
  18. English

    Carla and __________ don't think it is a good idea for __________ girls to go to Tom's Halloween party tomorrow night. A. them; us B. they; we C. them; we D. they; us c

    asked by Angela
  19. Algebra help please!

    Suppose you are researching the eating habits of people your age. What sampling method could you use to find the percent of students in your grade who eat five servings of fruit and vegetables each day? What is an example of a survey question that does not

    asked by Heather
  20. English

    Choose the correct sentence. A. Whom do you think you are? B. Give the ledger to Mr. Bon or me. C. Either me or you should win first place. D. The secret is between Joe and I. B

    asked by Angela
  21. Chemistry

    For the balanced redox reaction 2 Al(s) + 3 Br2(g) → Al2Br6(s), determine the number of electrons transferred in the overall reaction.

    asked by Sarah
  22. Chemistry

    Under acidic conditions, MnO4− becomes Mn2+. Write the balanced half-reaction for this transformation. (Omit states-of-matter from your answer.)

    asked by Tsion
  23. English III

    1)"On the occasion corresponding to this four years ago all thoughts were anxiously directed to an impending civil war. All dreaded it, all sought to avert it. While the inaugural address was being delivered from this place, devoted altogether to saving

    asked by AMK
  24. Algebra

    What is the sum (1 / 2b) + (b / 2)

    asked by Sandra
  25. Chemistry

    The problem is: Calculate the standard free-energy change for the following reaction at 25 degrees Celsius. 2Au^+3(aq) + 3Cr(s)-> 2Au(s) + 3Cr^+2(aq) I worked it out, getting half reaction: Au^3+ + 3e- -> Au; E = 1.498 Cr^3+ + 3e- -> Cr; E = -0.74 Ecell =

    asked by Tiffany
  26. Math

    how many different shapes can you make with the 4 triangles cut from this rectangle? how do you know?

    asked by banana
  27. English

    Two sentences joined together with a coordinating conjunction and a comma form a: A. compound sentence. B. complex sentence. C. comma splice. D. run-on. B

    asked by Angela
  28. Physics

    A cargo plane is flying horizontally at an altitude of 10000m with a velocity of 800km/h when a cargo pallet falls out the back ramp. (i) How long does it take to fall to the ground? (ii) How far horizontally is the pallet from where it fell off when it

    asked by Olumide Adesiyan
  29. Chemistry

    212 84Po→208 82Pb+AZX What would the value of A be here? 212 84Po→208 82Pb+AZX what would the value of z be here?

    asked by Jones
  30. English

    The editor is in charge of proofreading all of the __________ for the newspaper. A. head lines B. head-lines C. headlines' D. headlines D

    asked by Angela
  31. Physics

    A "reference ring" with moment of inertia Ic rests on a solid disk torsion pendulum with a moment of inertia I0. a) What is the period T0 for the motion with the disk alone? b) What is the period T1 for motion with the combined system? c) Use the

    asked by Tim
  32. Physics

    Help me please I'm stuck on this question 2.In a thunderstorm at 20.0°C, Karen sees a bolt of lightning and hears the thunderclap 3.00 s later. How far from Karen did the lightning strike? Show your work.

    asked by Me and I
  33. physics

    A hammer with 10 J of kinetic energy hits a nail and pushes it 5.0 mm into a plank. Both the hammer and nail come to rest after the collision. What is the average force that acts on the nail while it moves the 5.0 mm?

    asked by Anonymous
  34. Geometry

    In a garden, a birdbath 2ft 6 in. tall casts an 18-in. shadow at the same time an oak tree casts a 90-ft shadow. How tall is the oak tree?

    asked by Jess
  35. English

    Which of the following is a complex sentence? A. She was invited to the party, but she had already made other plans. B. He wasn’t hungry because he had a late lunch. C. The dog followed her around the apartment all day long. D. Initially, the conference

    asked by Angela
  36. English

    The topic sentence of a body paragraph: A. introduces the thesis statement. B. outlines one thesis point. C. is developed during the proofreading step. D. summarizes the essay’s main points. D

    asked by Angela
  37. Chemistry

    Balance the following redox (oxidation-reduction) reaction under basic conditions. (Include states-of-matter under the given conditions in your answer. Use the lowest possible whole number coefficients.) CrO42−(aq) + S2O32−(aq) → Cr3+(aq) +

    asked by Cam
  38. math

    The account balance on April 1st is $50.51. On April 15th a payment of $15.00 is made. On April 25th a purchase of $19.27 is made. The annual rate is 18%. What is the finance charge using the previous balance method? What is the new balance?

    asked by Anonymous
  39. math

    What is the average monthly income for these weekly incomes: $299.34, $203.49, $305.39, and $225.30? This is all the question gives me. Please help.

    asked by ale
  40. English

    Jessica's high grades in her geometry class made her mother and __________ very proud. A. myself B. I C. me D. ourselves C

    asked by Angela
  41. Chemistry

    Based on the cell reaction: Zn(s)+Cu2+(aq)→Zn2+(aq)+Cu(s) Under standard conditions, what is the maximum electrical work, in joules, that the cell can accomplish if 55.0g of copper is plated out? Wmax=______ J

    asked by Rebecca
  42. math

    6. Which is the best measure of central tendency for the type of data below–the mean, the median, or the mode? Explain. Hours of sleep each night Median; there will be outliers Range; there are no outliers Mode; the data are non-numeric Mean; the

    asked by TTR+S<3
  43. English

    A body paragraph in an essay is one that: A. expounds upon the thesis of the essay. B. brings closure to the piece. C. features footnoted information. D. introduces the ideas that will be covered in the essay. A

    asked by Angela
  44. Chemistry

    What mass of lithium phosphate is needed to prepare 500.0 mL of a solution having a lithium ion concentration of 0.1385 M?

    asked by Chris
  45. Math

    Brian's boat has a top speed of 9 miles per hour in still water. While traveling on a river at top speed, he went 10 miles upstream in the same amount of time he went 20 miles downstream. Find the rate of the river current.

    asked by Andrea
  46. MATH HELP

    which of the following is likely to have a mass of 2 kilograms 1.a grown elephant 2. a pineapple 3. a 3 year old child 4. or an acorn

    asked by A.J
  47. statistics

    Suppose a random sample of size 50 is selected from a population with σ = 10. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). a. The population size is infinite

    asked by Vanessa
  48. Math

    1. An assessment rate is 47%. The property tax is $39.94 per $1,000. What is the effective tax rate? Round to the nearest tenth of percent. 2. A property tax rate is $7.79 per $100 of assessed value. what is the tax rate as a decimal? Please help.

    asked by Mer
  49. Chemistry

    Write a nuclear equation for the indicated decay of each of the following nuclides. Th−234 (beta)......no clue O−15 (positron emission): 16/8 O-->16/7N + B+ (said was wrong) Ar-37: 37/18Ar + e ---> 37/17Cl + v (said was wrong) what would be the proper

    asked by Jones
  50. Chemistry

    Balance the following equation in basic solution. Phases are optional. I{-}+IO4{-} --> I3{-}+IO3{-}

    asked by ACDub
  51. Math

    A car moves along a straight road in such a way that its velocity (in feet per second) at any time t (in seconds) is given by v(t) = 3t sqrt(64−t^2) (0 ≤ t ≤ 8). Find the distance traveled by the car in the 8 sec from t = 0 to t = 8.

    asked by Vanessa
  52. English

    A dependent clause and an independent clause joined together form a: A. compound sentence. B. simple sentence. C. compound-complex sentence. D. complex sentence. D

    asked by Angela
  53. math

    Chris Shopper received a $800 discount loan to purchase a washer and dryer. The loan was offered at 10% for 120 days. What are the proceeds?

    asked by Anonymous
  54. Physics

    An object is 14 cm in front of a diverging lens that has a focal length of -7.9 cm. How far in front of the lens should the object be placed so that the size of its image is reduced by a factor of 1.9?

    asked by Neil
  55. English

    A sentence that consists of two or more main clauses and no subordinate clause is a: A. compound sentence. B. compound-complex sentence. C. complex sentence. D. simple sentence A

    asked by Angela
  56. chemistry

    Assume that no heat is lost to the surroundings and calculate the enthalpy involved when 200. mL of .10 M potassium hydroxide and 200. mL of .10 M hydrochloric acid are mixed. Both solutions began at room temperature, 24.5 degrees celsius, and have

    asked by Devon
  57. College Cal 1

    A farmer wants to fence off a rectangular field of area 15000 square feet using barbed wire fencing. SInce the opposite of the road is a corn-field, he wants a two-strand fence along the road, and one strand on each of the other three sides. What are the

    asked by DJ
  58. astronomy

    Rank the following hypothetical planets -- all of which have the same total mass and same radius -- from lowest moment of inertia to highest moment of inertia: 1) A uniform sphere of mixed up rock and iron 2) A rocky planet with an iron core 3) A rocky

    asked by keitanako
  59. Planets- I Love Space!

    why the outer planets did not lose the lighter gases in their atmospheres.?

    asked by Chloé
  60. M a t h

    A small plant manufactures riding lawn mowers. The plant has fixed cost (leases, insurance, etc.) of $48,000 per day and variable cost (labor, materials, etc.) of $1,400 per unit produced. The mowers are sold for $1,800 each. So the cost and revenue

    asked by Anonymous
  61. calculus

    A box is contructed out of two different types of metal. The metal for the top and bottom, which are both square, costs $5 per square foot and the metal for the sides costs $2 per square foot. Find the dimensions that minimize cost if the box has a volume

    asked by Griffin Bilskie
  62. Public Speaking

    Evaluating audience feedback to your speech presentation usually happens: A. before the speech. B. after the speech. C. during the speech. D. in the speech preparation

    asked by Holly
  63. c

    The topic sentence of a body paragraph: A. introduces the thesis statement. B. outlines one thesis point. C. is developed during the proofreading step. D. summarizes the essay’s main points. C

    asked by Angela
  64. Math

    A company is planning to expand its business in a few years. New plant construction costs are estimated to be $4.75 per square foot. The company invests $850,000 today at 6% compounded quarterly. a. How many square feet could be built in 3 1/2 years? b. If

    asked by Marsha
  65. Precalculus

    1. Consider the curve y=x^2. a. write down (dy)/(dx) My answer: 2x The point P(3,9) lies on the curve y=x^2. b. Find the gradient of the tangent to the curve at P. My answer: 2*3=6 c. Find the equation of the normal to the curve at P. Give your answer in

    asked by Anonymous
  66. Science

    a bomb of 5 kg explodes into two equal fragments. At what angle, these fragments fly apart?

    asked by Fate tree
  67. trig

    A car is on a driveway that is inclined 12 degrees to the horizontal. A force of 470lb is required to keep the car from rolling down the driveway. a) Find the weight of the car b) Find the force the car exerts against the driveway

    asked by Lisa
  68. accounting

    Wendell Corporation exchanged an old truck and $25,500 cash for a new truck. The old truck had a book value of $6,000 (original cost of $25,000 less $19,000 in accumulated depreciation) and a fair value of $7,700. Required: 1. Prepare the journal entry to

    asked by angela
  69. trigonometry

    An angle measuring (468n)° is in standard position. For which value of n will the terminal side fall along the negative portion of the x-axis

    asked by Anonymous
  70. Algebra

    What is the sum (1 / g+2) + (3 / g + 1)

    asked by Sandra
  71. statistics

    The College Board reported the following mean scores for the three parts of the Scholastic Aptitude Test (SAT) (The World Almanac, 2009): Assume that the population standard deviation on each part of the test is = 100. a. What is the probability a sample

    asked by Vanessa
  72. Chemistry

    A 4.379 g sample of MgCl2 is dissolved in enough water to give 750.0 mL of solution. What is the chloride ion concentration in this solution?

    asked by Chris
  73. science

    An H-R diagram? Answer Are Is a map of the position of the stars Graphs stars according to their size and distance List every known star Graphs a sample of stars according to surface temperature and absolute brightness Thank You

    asked by snow
  74. Physics

    Last question i'm stuck on please help me through this. Five waves pass a dock in 2.0 s. If the waves are traveling at 10.0 m/s, then what is the wavelength of the waves?

    asked by Me and I
  75. statistics

    Assume that the population proportion is .55. Compute the standard error of the proportion, ( ), for sample sizes of 100, 200, 500, and 1000 (to 4 decimals). a. 100? b. 200? c. 500? d. 1000?

    asked by Vanessa
  76. physics

    The drawing shows the top view of two doors. The doors are uniform and identical. Door A rotates about an axis through its left edge, and door B rotates about an axis through its center. The same force is applied perpendicular to each door at its right

    asked by Anonymous
  77. statistics

    Professor Smith gave a final exam in her history class. The scores on the final exam are normally distributed with a mean of 75 and a standard deviation of 6. If Professor Smith wishes to give A’s to the top 4%, what would be the cutoff score be for

    asked by Sally
  78. math

    Jerry is 50 inches tall growing at a rate of 1/24 inches per month. Adam is 47 inches tall growing at a rate of 1/8 per month. If they continue to grow at these rates for the next 4 years in how many months will they be the same height? Solve two different

    asked by Robin
  79. science

    Which of the following determine how long a star remains on the main sequence Answer Are MASS TEMPERATURE BRIGHTNESS ALL ABOVE THANK YOU

    asked by snow
  80. Algebra

    What is the difference (5x-2)/4x –(x-2)/4x

    asked by Sandra
  81. Algebra

    The area of a parallelogram is 115 square miles the base is= x+9 and the height is x-9. so the equation I got down which is 115=(x+9)*(x-9. Now I have to find the base and height in miles. Can someone help?

    asked by Christopher
  82. math

    Houston Community College is planning to construct a rectangular parking lot on land bordered on one side by a highway. The plan is to use 640 ft of fencing to fence off the other three sides. What should the dimensions of the lot be if the enclosed area

    asked by Ashley
  83. statistics

    People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a. Show

    asked by Vanessa
  84. Algebra

    What is the difference? (r+2 / r+4) – (3 / r + 1)

    asked by Sandra
  85. physics

    1. A car travels down a straight, flat, level road. Initially, the car is traveling at 80.0 km/hr Northward . After traveling 0.50 0 km , the car is traveling at 95 .0 km/hr. What is the magn i tude of the car ’ s acceleration during this interval ?

    asked by khaled
  86. Algebra help PLEASE?

    Create two different situations: one in which you use combinations and one in which you use permutations. Include specific details and an explanation about what makes each situation either a combination or permutation.

    asked by Aniston
  87. Math

    (2n + 2)(6n + 1) Find the product.

    asked by Sadie
  88. physics

    Four identical masses of mass 800kg each are placed at the corners of a square whose side lengths are 15.0cm . What is the magnitude of the net gravitational force on one of the masses, due to the other three?

    asked by name
  89. Physics

    A magnifying glass (a positive lens) with a focal length of +6 cm is placed 2 cm above a page of print. What is the magnification of this image?

    asked by Anonymous
  90. financial management

    A capital project has an initial investment of $100,000 and cash flows in years 1-6 of $25,000, $10,000, $50,000, $10,000, $10,000, and $60,000, respectively. Given a 15 percent cost of capital, •(a) compute the net present value. . •(b) compute the

    asked by lori
  91. PHYSICS

    A dog sitting 2.2m from a vertical mirror thinks its image is another dog. A)How far is the image from the dog? B)To investigate, the dog walks directly toward the mirror at 0.28m/s . At what rate does the dog approach its image?

    asked by Amy
  92. meiosis

    Explain how crossing over and independent alignment of chromosomes increase genetic variability?

    asked by Esteban
  93. physics

    The velocity of a simple harmonic oscillator is given by; v = + 6.92*sin(10.5*t) (mks units) What is its angular frequency? omega = What is the amplitude of the motion? A = Where is the mass at the time t = 86.08 seconds? x = If the mass is 0.53 kg, what

    asked by joe
  94. Math

    Richard Simmons is selling his house. He has a choice of taking $125,000 today or $135,000 in 6 months. If he takes the money today, he can invest it at Valley Bank at 5% interest compounded monthly. a. How much would be in the account after six months if

    asked by Mani
  95. AP Biology

    Why are Eukaryotes more difficult to Transform than Prokaryotes? What methods can be used to transform Eukaryotes?

    asked by Luis
  96. math trigonometry

    At night, a security camera pans over a parking lot. The camera is on a post at point a which is 53m from point c and 71 m from point b.the distance from B to c is 68m. Calculate the angle through which the camera pans

    asked by Gary
  97. Trigonometric Function

    A Ferris wheel has a radius of 10 meters and is revolving 6 times each minute (wheel's frequency.) The wheel's center is 12 meters from the ground. If time starts on the ground, then find a sine function that shows the height from the ground for a car on

    asked by Valerie
  98. math trigonometry

    At night, a security camera pans over a parking lot. The camera is on a post at point a which is 53m from point c and 71 m from point b.the distance from B to c is 68m. Calculate the angle through which the camera pans

    asked by Gary
  99. Physics

    The graph below shows the force applied to a 4.0 kg cart initially at rest but free to move on a horizontal track. Forces (in N) are measured on the ordinate and times (in s) are measured on the abscissa. Use the following values for the graph: a = 4.9 and

    asked by JAYZ
  100. Thermodynamics

    A 10m height cylinder with cross sectional area of 0.1 m2 has a massless piston at the bottom as shown in Figure Q2. Water is at the top of the piston with air at 20oC over it. Under the piston there is air at 300K. The volume of the air is 0.3m3. Heat is

    asked by Hao
  101. statistics

    Many drugs used to treat cancer are expensive. BusinessWeek reported on the cost per treatment of Herceptin, a drug used to treat breast cancer (BusinessWeek, January 30, 2006). Typical treatment costs (in dollars) for Herceptin are provided by a simple

    asked by Vanessa
  102. Math

    Find the average value of the function f over the interval [-1, 2]. f(x) = 1 - x^2

    asked by Vanessa
  103. math

    Water flows through a pipe with the inner diameter of 20cm at a speed of 1m/s. How long does it take for the water flowing out from the pipe to fill a cylindrical tank with the base radius of 0.8m and the height of 0.5m?

    asked by Tom
  104. chemistry

    I have to write a balanced equation for the reaction of a solid lead being added to a solution of silver nitrate. Solid silver forms and the lead disappears as it goes into the solution as lead (ii) nitrate. I think it should be Pb + AgNO3 >>>> Ag +

    asked by jazz
  105. Business Math

    Compute the simple interest. Assume 1 month to be of a year. Round your answer to the nearest cent. Principal Rate Time Interest $1,025 4.5% 16 months

    asked by Rita
  106. Math

    If Logan's family can drive 23.125 miles on 1 gallon of gas, how far can they drive on 17 gallons?

    asked by Ruby
  107. Thermodynamics

    A 10m height cylinder with cross sectional area of 0.1 m2 has a massless piston at the bottom as shown in Figure Q2. Water is at the top of the piston with air at 20oC over it. Under the piston there is air at 300K. The volume of the air is 0.3m3. Heat is

    asked by Hao
  108. math

    Suppose Maya made another sign with an area of 48 square inches. would this sign be larger or smaller than the sign with an area of 48 square centimeters? Explain how you know.

    asked by mimi
  109. Chemistry

    A solution of I2 was standardized with ascorbic acid. Using a 0.0500 g sample of the acid, 26.50 mL of I2 were required to reach the starch end point.

    asked by Alexis
  110. chemistry

    I am unsure about balancing equation I would like for someone to let me know if I am working this out correctly? I have to write a balanced equation for the reaction when solid magnesium is added to a solution of lead(ii)nitrate, solid lead forms and the

    asked by jazz
  111. algebra1

    Marissa earns $3.75per hour at a local fast food restaurant. write an expression for the amount of money she earns and determine how how much she is going to earn in 7 hours. A.3.75x;$26.25 B.7x;$26.25 C.3.75x+7x;$10.75 D.7x;$3.75

    asked by angela
  112. CHEMISTRY HELP !!!! Show work please!

    Compute the energy released in kilojoules when the sun converts 1.00 metric ton into energy. NOTE: 1 metric ton = 1000 kg.

    asked by Patrick
  113. chemistry

    A sample of hydrogen chloride gas occupies 0.550L at STP. What is the pressure in atm if the volume is 7.50×10−2L at 20∘C?

    asked by ally
  114. HELP!

    Next year (sophomore year) I'm taking the following courses: Honors Algebra II/Trig Spanish III Health AP Biology Honors English AP World History Is AP Bio and world history hard? or no it's not just the exam. Please tell me because this is my first year

    asked by Erika
  115. chemistry help~~~~ Please!!!

    Sodium-24, t1/2 = 15.0 hr, can be used to study the sodium balance in animals. If a saline solution containing 25 μg of 24^Na is injected into an animal, how long can the study continue before only 1 μg is left? Show work please!

    asked by Kim
  116. statistics

    Leslie took two midterm exams and earned the following scores: 82 on the chemistry exam (class distribution: μ = 75, σ = 6.25) and 63 on the physics exam (class distribution: μ = 59, σ = 3.57). Rounding to two decimal points, on which exam should

    asked by Sally
  117. statistics

    It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group

    asked by Sally
  118. physics

    Two wires are anchored at both ends. Wire 1 has a mass of 105 grams and a length of 6.9 m. Wire 2 has a mass of 60 grams, a length of 20 m, and a tension of 143 N. What must be the tension in Wire 1 if its third harmonic is to equal the first overtone of

    asked by johnny
  119. chemistry

    Adding a complex ion forming species to a solution will increase the solubility of a slightly soluble species. Calculate the Molar solubility (s) of AgI in a 1.75 M ammonia solution. The Ksp for AgI is 8.3 x 10-17 and the Kf for Ag(NH3)2+ is 1.5 x 107. I

    asked by bekah
  120. chemistry

    I have to write a balanced equation for the decompostion of solid copper (ii) sulfate to form the gaseous sulfur trioxide and solid coper (ii) oxide. I would appreciate it if you could tell me if I have written it correctly. CuSO4 >>> SO3 + CuO If I did

    asked by jazz
  121. Chemistry

    Titration of 50.0 ml of acetic acid reaches equivalence after delivery of 22.5 ml of standardized NaOH 0.21 M. What is the initial concentration of acetic acid and what is the pH of the solution? What is the pH at equivalence? What is the pH after addition

    asked by Sam
  122. Chemistry-need help ASAP

    15 ml of 3.0 M NaOH are added to the following: 500.0 ml of pure water 500.0 ml of 0.1 M formic acid 500.0 ml of 0.1 M formate of potassium 500.0 ml of a solution containing 0.1 M formic acid and 0.1 M formate of potassium. Calculate the difference of pH

    asked by Sam
  123. statistics

    Ashley and Sanjay are donating blood at a local hospital. As a standard practice, the blood is screened for anemia (low levels of red blood cells), and the results are given to each donor as a z score, ranging from negative scores (low amounts of red blood

    asked by Sally
  124. Math

    Jason Printing has $85,000 to invest. They can invest in Wilder Revenue at 10% compounded semiannually or at Cheapskate Investments at 9.8% compounded monthly. a. Calculate the two APYs and compare them to determine your answer. Make sure to distinguish

    asked by Maddy
  125. English

    He was taking a shower when I called. ----------------------- Q: Did I make a phone call or call his name shouting in the sentence?

    asked by rfvv
  126. Written Communication

    • Choose a topic from your personal knowledge and experience. Remember that you must utilize your first-hand experience to prove your authority to write on a topic. Purely generalized and/or factual information is not acceptable. • Write in your own

    asked by Nique
  127. Language Arts

    1. A factory might EMIT A. Pollution B. Smokestacks C. Resources 2. How do the members of Don't Be Crude make a persuasive appeal? A. By embarrassing people B. By educating people C. By encouraging people D. by making people laugh 3. What did Gina Gallant

    asked by Hannah
  128. chem090

    100.0 g of Potassium Phosphate reacts with 100.0 g of Barium Chloride. Which molecule is completely used up by the reaction? How many grams of the other molecule are left over? When I started with 100.0 g of K3PO4 I got 147.1g of BaCl2. When I started with

    asked by Jenny
  129. math

    A jar of coins has only nickels and quarters, which are worth a total of $3.25. There are 5 fewer quarters than nickels. How many quarters and nickels are in the jar?

    asked by Katie
  130. chemistry 2

    Titration of 50.0 mL of acetic acid reaches equivalence after delivery of 22.5mL of standardized NaOH 0.21 M. What is the initial concentration of acetic acid and what is the pH of the solution? What is the pH at equivalence? What is the pH adition of 20.0

    asked by philip
  131. Chemistry

    What mass of hydrogen gas is produced when a 7.43 g chunk of zinc dissolves in 500.0 mL of 1.200M HCl?

    asked by Chris
  132. Math

    Nikko knows that 20 percent of a number 56. To find the number, she uses the equation 56= 2over5x.Is Nikko correct. Explain.

    asked by Victoria
  133. trying to understand math

    Your store’s average basket (transaction) size for the month of March was $11.50 and you believe the average basket size will remain the same for your store in April. One of your hourly employees had an average basket size of $9.00 for the month of March

    asked by math
  134. English

    1. He is honest in himself. (Is this sentence grammatical? What is the meaning of 'in himself' then?) 2. He must be angry because she's not saying anything. 3. He has to be angry because she's not saying anything. (Are both the same and grammatical?) 4. He

    asked by rfvv
  135. Physics

    An airplane is flying at an altitude of 2,000 m with a speed of 216 m/s. What is the pressure of air outside the plane?

    asked by Sandra
  136. Chemistry

    In the SN2 mechanism, considering that the nucleophile attacks at the same time as the leaving group leaves, what would the effect of having a hindered (crowded) reaction center be on the rate of the reaction? Would you expect it to react slower or faster

    asked by Laura
  137. chemistry

    A ground water source contains 2.5 mg of F- ion per liter. a) what is the concentration of F- ions in moles per liter? b) will CaF2 (Ksp = 2E-10) precipitate when the concentration of Ca2+ = 5.0E-3M?

    asked by parker
  138. PHYSICS

    A laser is mounted on a table 1.04m above the ground, pointed at a vertical mirror a horizontal distance 3.46m away. The laser beam strikes the mirror 1.52m above the ground. Behind the laser is a wall, 2.80m from the aperture where the laser light

    asked by Amy
  139. Algebra

    To those who know how to use a ti84 plus calculator. Can anyone show me the steps on how to perform rational expressions and equations?

    asked by Christopher
  140. statistics

    What is wrong with the statement: It is believed that the proportion of Middle School teachers who leave the profession within 5 years is different from the proportion of High School teachers who leave the profession within 5 years. Test with a level of

    asked by Terri
  141. Physics

    A cue ball collides with two other snooker balls and comes to a complete stop. The angles between the centres at the point of collision are shown below. If the velocity of the incoming cue ball is 5 m/s, determine the velocities of all moving balls after

    asked by Olumide Adesiyan
  142. english 11

    Question about Nora's children in the book the A Doll's house.? 1. What have you Learned from My Mother? Write three short paragraphs, one from the point of view of each of Nora's children, describing. what the children feel they've learned from their

    asked by yasminb.
  143. Finance

    A company is planning to open 100 new outlets that are expected to generate, in total, $15 million in free cash flows per year, with a growth rate of 3% in perpetuity. If the company’s WACC is 10%, what is the NPV of this expansion?

    asked by Nabil
  144. physics

    the binding energy of a nucleus is 240.0 MeV. What is the mass defect of the nucleus in atomic mass units?

    asked by fifi
  145. physics

    A 15.4g bullet traveling at 270 m/s is fired into a 0.488kg wooden block anchored to a 100 N/m spring. How far is the spring compressed? x_{compressed} = If the speed of the bullet is not known but it is observed that the spring is compressed 43.9 cm, what

    asked by george
  146. Radioactivity

    The mass number of an atom undergoing beta decay doesn't change. However the daughter nucleus is a different element than the parent. Explain how this is possible

    asked by Anonymous
  147. Math help asap

    E^x/2.9099=ln 7.8x10^10

    asked by Nicola
  148. Physics

    A radar sends out a sound wave of 1.50 Mhz and senses it again from a moving car at a 1.40 Mhz. What is the speed of the car ?

    asked by Physics: Doppler Effect ?
  149. CALC 2 pls help!!

    In the following series x is a real number. In each case, use the ratio test to determine the radius of convergence of the series. Analyze the behavior at the endpoints in order to determine the interval of convergence. a. Summation n=0 to infinity

    asked by BAE
  150. math

    If z =1+2j and z =1+j 1 2 find z -3z 1 2

    asked by Geoff
  151. Social Studies

    I am the Star Reporter who is going to visit George Washington at his home at Mount Vernon during the years of 1759-1774. I am interviewing him about his political and personal views, activities, goals, and predictions. Develop 10 questions to ask

    asked by Anonymous
  152. health

    factors that help maintain a healthy weight

    asked by Linsay
  153. Calculus 2

    In the following series x is a real number. In each case, use the ratio test to determine the radius of convergence of the series. Analyze the behavior at the endpoints in order to determine the interval of convergence. a. Summation n=0 to infinity

    asked by BAE
  154. English

    What is the general purpose of a book review?

    asked by Victoria
  155. Math

    Find the average value of the function f over the interval [0, 8]. f(x) = 5e^-x

    asked by Vanessa
  156. Math

    An organization is planning a dance. The band will cost $400 and advertising costs will be $100. Food will be supplied at $2 per person and tickets cost $6 per person. How many people will have to attend the dance if the organization want to profit $400?

    asked by Shelly
  157. Chemistry - Science (Dr. Bob222)

    Consider reaction below: 50H3O^+(aq) + 7Cr2O7^2-(aq) +3I_2(aq) --> 6IO_4^-(aq) + 14Cr^3+(aq) + 75H2O (l) How many electrons are transferred in this reaction?

    asked by Adrik
  158. 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?

    asked by hassan
  159. algebra 1

    the width of a rectangle is 3 less than twice the length x. if the area of the rectangle is 43 square feet, which equation can b e used to find the length in feet. f. 2x(x-3)=43 g. x(3-2x)=43 h.2x+2(2x-3)=43 g. x(2x-3)=43 is it f. 2. sasha and lakeisha

    asked by angela
  160. Algebra

    how to solve algebra equation √(5x^2 )+7x+2-√(4x^2+7x+18) =x-4

    asked by Tuaha
  161. Chemistry

    Based on the mechanisms that you have determined and the information in the introduction, what is the product of 1-cholorobutane after reaction under the sodium iodide conditions? The ethanolic silver nitrate conditions?

    asked by Katie
  162. albebra

    solve arithmetically and algebraically. The perimeter of a rectangle is 54 cm. Its length is 6 cm. What is its width?

    asked by Robin
  163. Math

    Find the average value of the function f over the indicated interval [0, 8]. f(x) = 7/(x + 1) I keep getting the wrong answer.

    asked by Vanessa
  164. Chemistry, CO2 aq+H2O->H2CO3!

    How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million

    asked by Ramtin
  165. Calculus II

    Compute the first 5 terms of the sequence: {b(n)}n=1¨‡ = nã6n + (5/6)^n. ((that is:(Bsub(n))from n=1 to infinity = nth root of 6n + (5/6)raised to n.)) If the sequence converges, find the limit.

    asked by chelsea
  166. caculus

    By using a product rule for the differentiation, prove that ∫u dv=uv- ∫v du

    asked by the minahs
  167. Calc 2

    Consider the sequence: (a,sub(n))={1/n E(k=1 to n) 1/1+(k/n)} Show that the limit(as n-> infinity) A(sub(n))= ln 2 by interpreting a(sub(n)) as a Reimann Sum of a Definite Integral.

    asked by chelsea
  168. math

    tameka draws a line that would cut a square in half. she says makes 2 smaller squares. is tameka correct? explain

    asked by Anonymous
  169. social studies

    How do the words dialect and heritage help understand European culture?

    asked by Anonymous
  170. math

    If z˅1=1+2j and z˅2=1+j find (i) z˅1-3z˅2 (ii) z˅1z˅2 ___ (iii) z˅1z˅1 (iv) z˅1/z˅2

    asked by Geoff
  171. AP Biology

    What is the purpose of using a plasmid containing an antibiotic resistance gene in the transformation process?

    asked by Luis
  172. Alg.

    Given g(x) = x^2 – 3, find the following. g(−4 + h) − g(−4)/ h (all over h)

    asked by Kell
  173. alg

    If f is a 1-1 function and f(0) = 4, f(1) = 5, f(2) = 7, and f(3) = 9, find the following. f ^−1(5)

    asked by Kell
  174. math

    The sales goal for your store this week is $22,682. The sales goal for your store this week last year was $20,128. Your store has averaged 1775 transactions per week for the last four weeks. Assuming the number of transactions is consistent, what is the

    asked by help please
  175. Language Arts

    Which of the following places events in chronological order? A.formation of Negro Leagues, invention of baseball, Civil War B.invention of baseball, Civil War, formation of Negro Leagues C.invention of baseball, formation of Negro Leagues, Civil War

    asked by A.J
  176. Health

    What are four nutritional an physical exercise goals?

    asked by Linsay
  177. Chemistry, CO2 aq+H2O->H2CO3!

    How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million

    asked by Ramtin
  178. Physics

    Gravity on Mars is 1/3 of that on earth. If Mars atmosphere is only 2 km thick, what is atmospheric pressure on Mars?

    asked by Sandra
  179. Chemistry, CO2 aq+H2O->H2CO3!

    How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million

    asked by Ramtin
  180. Math

    Find the average value of the function f over the indicated interval [0, 8]. f(x) = 7/(x + 1) I keep getting the wrong answer.

    asked by Vanessa
  181. Math

    Find the average value of the function f over the interval [-1, 2]. f(x) = 1-x^2

    asked by Vanessa
  182. Math

    (6x4 – 3x + 5) – (3x4 + 4x3 – 6x2 + 1)

    asked by Anonymous
  183. math

    Your store’s average basket (transaction) size for the month of March was $11.50 and you believe the average basket size will remain the same for your store in April. One of your hourly employees had an average basket size of $9.00 for the month of March

    asked by math
  184. Math

    Find the average value of the function f over the interval [-1, 2]. f(x) = 1-x^2

    asked by Vanessa
  185. math

    Whats 4,580+250

    asked by aaliyah
  186. cal

    future value compounded continuously is B(t)=P(1+r/k)^kt and the present value compounded continuosly is P(T)=B(1+r/k)^-rt True or false and why

    asked by rystal
  187. calculus

    false

    asked by Anonymous
  188. English

    Internal motivation is

    asked by Jenny
  189. Chemistry, CO2 aq+H2O->H2CO3!

    How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million

    asked by Ramtin
  190. Science radioactivity

    why are alpha and beta radiation referred to as particles while gamma radiation is referred to as rays?

    asked by Anonymous
  191. Chemistry, CO2 aq+H2O->H2CO3!

    How many grams of CO2 are needed to neutralize a 5 liters water with a pH of 11 to 7? under the following conditions: P: 4000 psi, T:230 oF Note: CO2 is a one of oil reservoir fluid components with mole percent 0f 3.6%. thanks a million

    asked by Ramtin
  192. math, science

    a vertical shaft 150mm in diameter rotating 100r.p.m resrs on a flat end foot step bearing.the shaft carries a vertical load of 20kN assuming uniform pressure distribution and coefficient equal to 0.05, estimate power lost in friction

    asked by anuska
  193. English

    In each stanza of Dioondra's peom "If", she seems to wonder whether. The mountains can reach into the clouds People will laugh at her work or appreciate it She can find a job painting windowsills She could survive a storm in a raging

    asked by shawn miles
  194. marketing

    can someone please specify a purchase order i am having troubles

    asked by josh
  195. Math

    Find the average value of the function f over the indicated interval [0, 8]. f(x) = 7/(x + 1)

    asked by Vanessa
  196. HELP!

    Need some help with the 6:3:1 ratio question. Don't understand.

    asked by ashley
  197. math

    What is 8% of 15?

    asked by Caroline