Questions Asked on
April 1, 2012

  1. Trig

    A carousel with a 50-foot diameter makes 4 revolutions per minute. a) Find the angular speed of the carousel in radians per minute. b) Find the linear speed in feet per minute of the platform rim of the carousel.

  2. problem solving

    a stack of firewood has 28 pieces on the bottom row,24 on the top of those,then 20 ,and so on.If there are 108 pieces of wood.How many rows are there?

  3. AP Chem

    Sulfuric acid (H2SO4) is a very strong diprotic acid. If 0.054 moles of sulfuric acid is mixed with water to make 667 milliliter of solution,what is the molarity of H+? Answer in units of M doing mole/liter doesn't work

  4. Chemistry

    At 22 °C an excess amount of a generic metal hydroxide M(OH)2, is mixed with pure water. The resulting equilibrium solution has a pH of 10.56. What is the Ksp of the compound at 22 °C? I have found my [OH-] concentration (3.63x10^-4) but I'm not sure I'm

  5. Chemistry

    The following equilibrium was studied by analyzing the equilibrium mixture for the amount of H2S produced. Sb2S3(solid)+3H2(gas)2Sb(solid)+3H2S(solid) A vessel whose volume is 2.5L is filled with 0.0100 mole of antimony(III)Sulfide, Sb2S3, and 0.0100 mole

  6. math

    A giant tortoise can live 175 years in captivity. The gastrotrich, which is a small aquatic animal, has a life span of only 3 days (72 hours). If a gastrotrich died after 36 hours, a giant tortoise that lived 87.5 years would live proportionally the same

  7. statistics

    A football coach claims that the average weight of all the opposing teams’ members is 225 pounds. For a test of the claim, a sample of 50 players is taken from all the opposing teams. The mean is found to be 230 pounds, and the standard deviation is 15

  8. chemistry

    Write a balanced equation for the neutralization of each of the following. Express your answer as a chemical equation. Identify all of the phases in your answer. Part A: H3PO4(aq) and NaOH(aq) Part B: Hl(aq) and LiOH(aq) Part C: HNO3(aq) and Ca(OH)2(aq

  9. physics

    A tow truck is connected to a 1500 kg car by a cable that makes a 27 degree angle to the horizontal. If the truck accelerates at 0.58 m/s^2, what is the magnitude of the cable tension? Neglect friction and the mass of the cable.

  10. statistics, please help

    Thaarugo, inc., produces a GPS device that is becoming popular in parts of scandinavia, When thaarugo produces one of these, a printed circuit board (PCB) is used, and it is populated with several electronic components, Thaarugo determines that it needs

  11. English

    A few more things.Thank you. “Why don’t we go to the seaside for the weekend?” he asked (us). He proposed going to the seaside. He proposed that we should go...(??) Can you tell me if the names below are female or male names? Thank you. Helen (F)

  12. URGENT Spanish help please.

    ok in the example it shows: ¿Comprendes espanol? Si, lo comprende ok for this question it's asking 1) do you and your siblings practice tennis my response: no, no los practicamos.. it said i was wrong how would I correct that 2) it asked does your mother

  13. english

    DESCRIPTIVE WRITING A song or piece of music comes to the radio. Immediately the tune reminds you of a particularly happy or sad occasion. Describe in detail the scene you remember (real or imaginary) and your feelings at that time: It was my first day

  14. Mechanics (A level), Please help

    A light string of length a is attached to two points A and B on the same level and distance b apart, where b < a. A smooth ring of weight W is threaded on the string and is pulled by a horizontal force P, so that it rests in equilbrium vertically below B.

  15. Chemistry(Please respond, thank you)

    What is the [H3O+] for a neutral solution at 50 degrees celsius? I know that kw=[H3O+][OH-] but I am not sure what to do to get the H3O. The value I have for kw=5.76e-14 and I have the pH 6.62 but I do not know what the OH would be. Chemistry(Please help,

  16. Physics

    Two disks are rotating about the same axis. Disk A has a moment of inertia of 4.53 kg·m2 and an angular velocity of +4.55 rad/s. Disk B is rotating with an angular velocity of -6.86 rad/s. The two disks are then linked together without the aid of any

  17. Chemistry

    Experiment Na2C2O4 is added to Pb(NO3)2.Precipitate forms (I think its PbC2O4). After the liquid above was decanted to another container. Dilute HNO3(aq) was added to it. The decanted cloudy solution cleared up a little but it was kinda cloudy still. Im

  18. Trig

    Use the half-angle formulas to come up with an exact expression for each function value below. You do not have to simplify your answers. cos(pi/16)

  19. chemistry

    what pressure, in atmosphere, is exerted by 0.52 mol of water vapor at its boiling point of 100 degrees celcius in a 3L teakettle?

  20. physics

    In a conversion from military to peacetime use, a missile with a maximum horizontal range of 170 is being adapted for studying the upper atmosphere. What is the maximum altitude it can achieve if launched vertically?

  21. Chemistry

    Would you expect PbCl2 to dissolve in dilute HNO3(aq)? Explain in terms of solubility (Ksp)/equilibrium?

  22. AP CHEM

    When 0.03 moles of lead(II) nitrate are dissolved in enough water to make 266 milliliters of solution, what is the molar concentration of nitrate ions? Answer in units of M I already tried moles per liter and it says it is wrong.

  23. Physics

    The image of a crayon appears to be 20.6 cm behind the surface of a convex mirror and is 1.64 cm tall. The mirror’s focal length is 54.3 cm. a) How far in front of the mirror is the crayon positioned? Answer in units of cm I keep on getting it wrong so

  24. Operations Management

    What trade-offs must a firm make in developing a long-range capacity plan? How does capacity planning differ from manufacturing and service firms? I have an idea of what the answer to these two are but I do not know if they are right. Just need a little

  25. math

    write an equation of an ellipse: Major axis 12 units long and parallel to the y-axis, Minor axis 8 units long, center at (-2,5)

  26. italy- 6th grade

    Which of the following contrbuted to the heavy soil erosion in italy? a. volcanic activity b. heavy rainfall c. over farming d. overgrazing by goats and sheep my answer: heavy rainfall am i right?

  27. physics

    Two blocks with masses m1 = 7 kg and m2 = 4 kg are connected with a rope and move on two surfaces of a right-angled wedge as shown in Fig. 6.6 Given that θ1 = 37 °, θ= 53°, μ= 0.2, and μ= 0.1, find the acceleration of the blocks

  28. Fundamental of computer science

    Pseudocode CountPositive integer totalPos,number Begin loop Input numbers If number>0 then totalPos

  29. Prob/Stat

    If P(A) = .3 and P(B) = .4 and P(AandB) = .2 what is P(A/B)? P(B/A)? Are A and B indepentent?

  30. System Analysis

    Suppose you are an analyst developing a new executive information system intended to provide key strategic information from existing corporate databases to senior executives to help in their decision making. What type of metholodogy would you use?

  31. Physics

    Ed(height of 2.3 m) is 30 m away from the passenger side of a car. The radius of curvature of the mirror is -4m. How far from the mirror is the image? Is the image virtual or real? How tall is the image?

  32. Physics

    The drawing shows two identical systems of objects; each consists of the same three small balls connected by massless rods. In both systems the axis is perpendicular to the page, but it is located at a different place, as shown. The same force of magnitude

  33. Math

    Troy is building a pool that is proprtional to an olympic-sized pool the width of his pool will be 625 centimeters find the scale factor.

  34. math

    Compute the compound quarterly amount after 1 year for $100 invested at 12% interest compounded quarterly. What simple interest rate will yield the same amount in 2 years?

  35. phoenix

    would Paul be able to claim that he as in the 100 percentile, if his exam score was based off of extra credit and the highest possible score of the exam was 90% without the extra credit points? What would Paul's ranking be then

  36. math

    Calculate the future value of an annuity of $200 per month for 4 years at 12% interest compounded monthly

  37. math problem

    please help Simplify Multiply (2ã7-4ã2)(5ã7+10ã2)

  38. Physics

    A 185kg refrigerator is loaded into a van by moving it up a 10.0m long frictionless ramp that is at an angle of 11.0 degrees. How much work is done?

  39. Physics

    What is the kinetic and potential energy of a Boeing 747 airliner weighing 2.48 106 N, flying at 268 m/s (i.e., 600 mi/h) at an altitude of 6.2 km (i.e., 20 103 ft)?

  40. Ap chem

    When 80.4 moles of calcium acetate are dissolved in enough water to make 222.2 milliliters of solution, what is the molarity of acetate ions? Answer in units of M I already tried moles/liter and it was wrong

  41. Trig

    y=2tan(x-1) Find the period and phase shift.

  42. Chemistry(Please check)

    Which 0.10M solution has the lowest pH? NaCl, KCN, LiF, RbClO, all have the same pH. I think that the answer is that they all have the same pH. Would you agree? Thank you!

  43. Trig

    y=sin(2pi*x-pi) find the amplitude, period, and phase shift

  44. physics please help:)

    A car misses a turn and sinks into a shallow lake to a depth of 8.9 m. If the area of the car door is 0.51 m2, what is the force exerted on the outside of the door by the water? Note: 1 atm = 101.325 kPa. What is the force exerted on the inside of the door

  45. Intermediate Algebra

    Sqrt(-24) Show work.

  46. Math

    A typical human newborn weighs 150lbs, while a newborn weighs approx 7lbs. An adult Western grey Kangaroo weighs about 30 kilograms and gives birth to babies who are approx 1 gram. If human babies were proportionally the same weight to adults as Western

  47. statistics

    If the grades on a police entrance exam are normally distributed with a mean of 100 and a standard deviation of 15, what percentage of students received grades of less than 115?

  48. physics

    On a perfect fall day, you are hovering at low altitude in a hot-air balloon, accelerated neither upward nor downward. The total weight of the balloon, including its load and the hot air in it, is 24000 N. Find the weight of the displaced air. I got the

  49. physics

    A ray of light of vacuum wavelength 550 nm traveling in air enters a slab of transparent material. The incoming ray makes an angle of 37.4◦ with the normal, and the refracted ray makes an angle of 22.0◦ with the normal. Find the index of refraction of

  50. physics

    Radioactive decay of granite and other rocks in Earth's interior provides sufficient energy to keep the interior molten, to heat lava, and to provide warmth to natural hot springs. This is due to the average release of about 0.03 J per kilogram each

  51. algebra

    Simplify, using only positive exponents in your answer. x^-4+y^-4/x^-3+y^-3

  52. Chem 2

    Is this how I right this formula for dichlorodiaquoplatinum (II) (PtCl2(H2O)2)

  53. Chem 2

    Is this the correct formula for dichlorotetramminechromium (III) nitrate? (CrCl2(NH3)4 NO3)

  54. chemistry

    A 200-mL sample of Oxygen gas is collected at 26 degrees C and a pressure of 690 torr. What volume will the gas occupy at STP (0 degree C and 760 torr)

  55. Chemistry

    how many grams of sodium acetate must be added to 135 mL of a .115M solution of acetic acid to produce a buffer of pH 4.75?

  56. Trig

    A 7.25 inch circular saw blade rotates at 5200 revolutions per minute. a) Find the angular speed of the saw blade in radians per minute. b) Find the linear speed in feet per minute of one of the 24 cutting teeth as they contact the wood being cut.

  57. math

    A liter of petrol weighs 0.7 kg. How many liters of water will have the same weight as 10 liters of petrol if 1 liter of water weighs 1 kg?

  58. English

    A last question. Can you please check these sentences? 1) “Would you like to go for a motorbike ride?” he said to me. 2) “What about making pizza for dinner?" he said. (or asked?)

  59. Physics

    110 tonne steam engine uses a force of 400 kN to pull two coal trucks (each with a mass of 45 tonnes) up a 3.00° degree incline. If the coefficient of friction involved is 0.080, determine the tension, T, in the coupling between the trucks.

  60. ul

    what is the true value of mass of 40.00ml of water

  61. Chemistry

    Calaculate the initial heat energy before mixing as the sum of (mcpt) for the hot and cold water,using Cp=4.184J/g-c

  62. Critical Thinking

    What is the rhetoric device in this sentence: "The right to life includes and implies the right to commit suicide To hold otherwise to declare that society must give you permission to kill yourself"

  63. Chemistry

    Which of the following solution should be mixed with 50.0 mL of 0.050 M HF solution to make an effective buffer? A) 50.0 mL of 0.10 M NaOH B) 25.0 mL of 0.10 M NaOH C) 50.0 mL of 0.050 M NaOH D) 25.0 mL of 0.050 M NaOH

  64. Anthropology

    Ethnographic methods are to ethnological methods as: (Points : 1) the humanities are to the sciences. fieldwork is to laboratory experiments. description is to comparison. nature is to culture.

  65. biology

    Below the human hemoglobin sequence are the first thirty amino acid sequences of several other species’ hemoglobins. Inspect the sequences and answer the following questions: Human) h l t p e e k s a v t a l w g k v n v d e v g g e a l g r l A) ml t a e

  66. math-percents

    what percent is .624?

  67. Living Environment (BLOOD FLOW OF THE HEART)

    What's an easy way to remember blood flow in the heart? I need to tell the teacher it by speaking the parts of bloodflow.

  68. Geography

    How do earthquakes occur at faults?

  69. healthcare quality and risk management

    Discuss the role of stakeholders in quality and risk management including the relationships between employers and third party payers with healthcare organizations. What roles do each play in quality and risk management, if any? What is the impact on the

  70. trig

    Give the following for the function: y=2+cos(5x+3.14 Amplitude: Period: Phase Shift:

  71. physics

    A 140 g arrow is shot vertically from a bow whose effective spring constant is 500 N/m. If the bow is drawn 60 cm before shooting the arrow,to what height does the arrow rise?

  72. AQA Mechanics (M1), Statics and forces, please hel

    A particle of weight W is attached by a light inextensible string of length a to a point A on a verticle wall. The particle is supported in equilbrium by a light rigid strut of length b attached to a point B on the wall at a distance a vertically below A.

  73. math

    In order to have $10000.00 in 5 years, how much would a person have to invest if the money will earn 8% interest compounded semiannually?

  74. Physics

    A candle, 3.5 cm high, placed 29 cm in front of a curved mirror forms an image at a distance of 12 cm from the mirror. Focal length of mirror? How high is the image? What type of mirror is this?

  75. physics--please help

    You are traveling in a car toward a hill at a speed of 40.8 mph. The car's horn emits sound waves of frequency 243 Hz, which move with a speed of 340 m/s.The frequency with which the waves strike the hill is 254.7Hz and the frequency of the reflected sound

  76. math

    The ratio of girls to boys in a science class is 5:6. Can there be 15 boys in the class? Explain why or why not.

  77. chemistry

    I need some help with making a solubility rule for CrO4 -2 for my chemistry homework.

  78. physics

    A 124- balloon carrying a 22- basket is descending with a constant downward velocity of 27.4 A 1.0- stone is thrown from the basket with an initial velocity of 20.0 perpendicular to the path of the descending balloon, as measured relative to a person at

  79. math

    Jane needs $30,000 to buy another car in eight years. How much should she deposit at the end of each half year into an account that earns 6% interest compounded semiannually?

  80. chemistry

    Balance each of the following neutralization reactions. Express your answer as a chemical equation. Identify all of the phases in your answer. Part A: HNO3(aq) + Ba(OH)2(s) ---> Ba(NO3)2(aq) + H2O(l) Part B: H2SO4(aq) + Al(OH)3 ---> Al2(SO4)3(aq) + H2O(l)

  81. Science

    michelle weighs 900 N. How much pressure does she apply when she stands on her head, if the part of her head touching the floor has a radius of 2cm?

  82. chemistry

    Balance each of the following neutralization reactions. Express your answer as a chemical equation. Identify all of the phases in your answer. Part A: HNO3(aq) + Ba(OH)2(s) ---> Ba(NO3)2(aq) + H2O(l) Part B: H2SO4(aq) + Al(OH)3 ---> Al2(SO4)3(aq) + H2O(l)

  83. chemistry

    Complete and balance the equations for each of the following reactions. Express your answer as a chemical equation. Identify all of the phases in your answer. Part A: KHCO3(s) + HCl(aq) ---> Part B: Ca(s) +H2SO4(aq) ---> Part C: H2SO4(aq) + Al(OH)3(aq)

  84. meeting your client`s needs

    which one of these factors is generally the strongest single element in creating the mood of a room?

  85. chemistry

    Using the concentration of CH3COOH (0.8326M) and the equilibrium concentration of H3O+ (OJ = 31.6x10^-6 and milk = 3.16x10^-8), complete the reaction table for vinegar. Then calculate the acidity constant. Please show all work in solving the problem.

  86. math

    How much money must you deposit now at 6% interest compounded quarterly in order to be able to withdraw $5000 at the end of each quarter for five years?

  87. Calculus

    Suppose f(x) is a differentiable function with f(-1)=2 and f(2)=-1. The differentiable function g(x) is defined by the formula g(x)=f(f(x))' A. Compute g(-1) and g(2). Explain why g(x)=0 must have at least one solution A between -1 and 2. B. Compute g'(-1)

  88. algebra

    Add or subtract as indicated. 5x/x+3+28/x-3-90/x^2-9

  89. Trig

    Why does 11.4(7pi/18)=133pi/30 ?

  90. infinite math

    Hey guys! really need help with this one!!! On December 31, 1995, a house is purchased with the buyer taking out a 30-year $90,000 mortgage at 9% interest compounded monthly. The mortgage payments are made at the end of each month. Calculate: (A) the

  91. physics

    A hydraulic press has an input cylinder 1 m in diameter and an output cylinder 2 meters in diameter. Assuming 100% efficiency, find the force exerted by the output piston when a force of 10 Newtons is applied to the input piston. pounds If the input piston

  92. 7th grade math

    For these two problems, you would need to find the slope and y intercept and then write the equation in equivalent to ax + by + c. y=3x y=0 Please help and explain how to do it. Thank you

  93. physics

    What pressure does a 155Newton woman exert on the floor when she balances on one of her heels? Her heels have an average radius of 0.0005 m.

  94. Physics

    A dentist's chair with a patient in it weighs 2260 N. The output plunger of a hydraulic system begins to lift the chair when the dentist's foot applies a force of 61 N to the input piston. Neglect any height difference between the plunger and the piston.

  95. math

    Davey reads 45 pages in an hour. Sally reads 55 pages in an hour. If Davey begins to at 2pm and Sally starts to read at 2:40pm, at what time will they be reading the same exact page?

  96. Economics(Please help)

    Given the wage in dollar per day and the CPI for years 1 and 2 how do you calculate the nominal % increase in wage and the real % increase in wage? I am not sure what to do for this or what the formula is if any. Thank you for your help.

  97. Chemistry

    How many moles of hydrogen gas will be produced by the reaction of 4.05 g of aluminum with hydrochloric acid? Need help setting up the problem...is it: 4.05g AlCl3 x 1mol AlCl3/133.2 AlClc x 2 mol Al/3 mol H?

  98. HSM 210 Final Project

    Help ne with Final Project

  99. math

    Estimate the cost of the concrete requred to make a concrete sidewalk shaped as follows. (The sidewalk covers 1/4 of the outer perimeter of a circle - from 3:00 to 6:00. The radius from the center of the circle to the outside perimeter is 20 feet. The

  100. chemistry

    he gaseous reaction depicted below is carried out at constant pressure and an initial temperature of -71°C. The unbalanced equation is CD C2 + D2. What is the final temperature (in °C)?

  101. Organic Chemistry

    Hemoglobin (Hb) in the blood absorbs oxygen to form oxyhemoglobin [Hb(O2)2], which transports oxygen to the cells. The equilibrium can be generally represented by the following (though it is actually composed of a series of equilibria in which Hb binds

  102. math

    In an experiment, Marissa must select a letter card below and spin the spinner once. A B C D 1 2 3 What is the probability that Marissa's outcome will be the letter card A and the number 3 on the spinner?

  103. Physics

    What is the wavelength of a radar signal that has a frequency of 30 GHz? The speed of light is 3 × 10^8 m/s. Answer in units of m Giving me the formula is just fine

  104. english

    can you please suggest any books for different types of writing styles?

  105. Trig

    y=sec(2x+1) Find the period and phase shift. Sorry i'm really bad at these.

  106. English (DGP)

    what part of speech is "then" in this sentence: the old lady pulled her spectacles down and looked over them about the room then she put them up and looked out under them

  107. chemistry

    he gaseous reaction depicted below is carried out at constant pressure and an initial temperature of -71°C. The unbalanced equation is CD C2 + D2. What is the final temperature (in °C)?

  108. math

    The average of two numbers is 34. The first number is three times the second number. what are the two numbers?

  109. math

    Dianna used 5/6 yd of fabric to cover a bulletin board.She use 4/9 yd of fabric to decorate a vase. How many yards of fabric did Dianna use in all?

  110. English

    What does this quote mean from the book Wuthering Heights?: "Well, I won't repeat my offer of a wife: it is as bad as offering Satan a lost soul"

  111. WORLD HISTORYY

    a) What cultural obstacles did Peter I face in his attempt to make Russia more like the countries of western Europe? b) Why are rulers usually more successful in making political and military changes than social changes?

  112. physics

    mass of coaster is 800kg second hill is 70m do you take 800*70*9.8=548800 Please help

  113. English

    Writeacher, the website you suggested to me for reading comprehension is excellent but the texts are too short. They should be twice as long. Do you have other ideas?

  114. physics

    mass of a coaster is 800kg height of first hill is 80m What is the agpe for the first hill? I did 800*9.8*80=627200

  115. physics

    A ray of light traveling in air strikes the surface of a liquid. If the angle of incidence is 33.5◦ and the angle of refraction is 19.8◦, find the critical angle for light traveling from the liquid back into the air. Answer in units of◦

  116. Trig

    1)y=1-tan(3pi-2x) Find period and phase shift 2)y=-sin(5x+3) Find amplitude,period,and phase shift 3)y=1-sin(3pi-2x)Find amplitude,period,and phase shift 4)y=2csc(2x-1)Find period and phase shift 5)Given the graph of y = sin (x), what transformation can be

  117. English

    Q)'The radio crackled as the distant voice spluttered and died.Now they felt completely alone., but surely there must be others like them out there. Write a narrative,using this last phrase at the beginning or end of your story. 'Sami,Sami! Please god,

  118. electricity and electronics

    9.electrons are emitted from a conductor when the conductor is

  119. math problem

    convert to decimal notation 8.67x10^7

  120. MATH - Please help!

    Find the present value of $6000 payable in four years at 16% simple interest Thanks a bunch!

  121. calculus

    the dimensions of a closed rectangular box are measured as 30 in, 40 in.. and 60 in.. with a maximum error of 0.2 in. in each measurement. use differentials to estimate the maximum error in calculating the volume of the box

  122. Math

    Wallace made 14 1/2 cups of soup He used 2/3 in each cup of soup How much water did Wallace put in the soup

  123. applied physics

    Calculate the magnitude of the torque produced by two 25N forces that are 3m apart and in opposite directions

  124. Math

    A goal for elite runners is to complete a mile in 4 minutes. At what speed(in miles per hour) is a runner traveling when he completes a mile in 4 minutes?

  125. statistics

    If a spinner labeled 1-7 was spun 150 times, what is the probability of getting a prime number?

  126. Science 7R Help!

    Science Hw - TB pg 621 Reviewing Vocab. 1-10 Checking Concept 1-10 I'm on reviewing vocab. qs. 8 and I'm having trouble with this inorganic nutrient isn't food group? mineral? protien? nutrient? if im wrong can you provide me a info. that I can read that

  127. Chemistry(Please help)

    What is the equilibrium constant for the reaction of ammonium ion with formate ion? I know that the ionization constant for ammonium ion is Ka=5.6e-10 and for formate Kb=5.6e-11. I am not sure what to do next. Should I divide ka by kb?

  128. math

    sam said if he ate half of a pie and ava ate a fourth of the pie then three-fourths of the pie will have been eaten

  129. chemistry

    Question 4-6 refer to : 3Ag(s) + 4HNO3(AQ) = 3AGNO3(aq) + NO(g) + 2h2o(l) 4. How many moles of NO can be produced by the reaction of 54.0g of Ag? 5. How many grams of AgNO3 can be produced by recating completely 88.0g of Ag? 6. State the number of grams of

  130. Chemistry(Please check)

    Which of the following equations correspond to the Ka2 for phosphoric acid? note: the double equal sign (==) means equilibrium. a) HPO42- (aq) + H2O (l) == H3O+(aq) + PO43-(aq) b) PO43- (aq) + H2O (l) == HPO42-(aq) + OH–(aq) c) H3PO4 (aq) + H2O (l) ==

  131. biology

    I have the fetal pig test on muscles in AP biology class coming up soon. And I was wondering if anyone knows any good online sites where thye give pictures and i can practice labeling the muscles on the pig.. thanks

  132. calculus

    lim -7 + (7/x)/ 6 - (1/x2) x¨-‡

  133. calculus

    find implicit derivative of 2y^2 - x^2 = 3xy + 5

  134. Trig.

    Josh kicks a soccer ball with an initial velocity of 18 feet per second out of a window from a height of 12 feet. The function h(t)= -16t^2+18t+12 represents the height of the soccer ball after t seconds.What is the domain of this function in the context

  135. algebra

    How do you find the height of a triangle with one side that is 8cm another side is 6cm and the base is 10cm?

  136. writing

    Which of the followinh is Not an example of persuasive writing? a position paper from an elected official a college admissions essay a movie review a summary of a textbook reading assessment (answer) Which of the following is a hasty generalization?

  137. calculus

    Let f(x) = (x − 3)−2. Find all values of c in (2, 5) such that f(5) − f(2) = f'(c)(5 − 2). (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) C=?

  138. math problem

    Please help Solve ã9x+67=x+5

  139. Calculus

    A lemon tree nursery usually sells a certain breed after 4 years of growth and shaping.the growth rate is approximated by: dh/dt =2.4t+3 where t is time in years and h is the height in cm. suppose that seedlings are 10 cm tall when planted (at t=0) a) find

  140. Calculus

    A lemon tree nursery usually sells a certain breed after 4 years of growth and shaping.the growth rate is approximated by: dh/dt =2.4t+3 where t is time in years and h is the height in cm. suppose that seedlings are 10 cm tall when planted (at t=0) a) find

  141. Chemistry(Please check)

    A 0.0170 M solution of an acid has a pH of 2.5. What is the pKa? i did 10^-2.5=3.16e-3 Then 0.0170 - 3.16e-3=0.01384 ka= (3.16e-3)^2 / 0.01384 = 7.21e-4 pKa = -log(7.21e-4) = 3.14 The pKa is 3.14 Would you agree?

  142. Vertex edge graphs

    OK so my friend asked me how to solve this question i didn't know how but tried anyway and got the right answer but i want to know if i did it correctly 6 boys are working on 5 go carts. each boy works on more than one cart. it takes one weekend to make

  143. social studies

    Hi i need to identify and discuss 3 specific acts of the british in the 1760s that led to colonial restiance against british authority. Do you have any examples I could use? Also are there any from the 1770s?

  144. Intermediate Algebra

    1/2ã12 times 8ã3

  145. Mathematics

    What is 0.6417 divided by 31

  146. science

    why an astronaut would be able to lift heavy equipment more easily on the moon thanon earth?

  147. science

    what you could conclude about the temperature of Mercury based on its position in the solar system?

  148. Physics

    An object 3.35 cm tall is placed 10.8 cm in front of a mirror, which creates an upright image that is 5.61 cm in height. a) What is the magnification of the image?

  149. Trigonometry

    Solve the equation sin^2x-cos^2x=0 over the interval [0, 2pi). Having trouble getting started.

  150. Life orientation

    Describe pollution

  151. 6th grade geography, Italy

    What are the different types of Italian industries? thanks to any and all help.

  152. 6th grade geography, Italy

    What are the advantages and disadvantages to Italy of having such diverse regions? 2 of each- disadvantages, and advantages

  153. math

    what is the equation of a line with tge point (-2,-4) and (3,6) please help

  154. Intermediate Algebra

    The average cab ride cost per mile(x) is given by f(x)=2x+3.50, where x is miles and f(x) is money. A. Find the cost of a 5 mile ride. B. Find the cost of a 3/4 mile ride. C. How many miles can you go in $50?

  155. physics

    So if I have two light bulbs with different wattage how could I show what happens to them in series and parallel. The voltage remains the same.

  156. Math Situation

    find the polynomial for the perimeter and for the area A+2 A

  157. writing

    Can someone please check my answers which of the following would always require a citation in a research paper? thesis statenment an anecdotal experience a quotation (answer) a humorous statement Which of the following shows the correct parenthetical

  158. English

    I left out the following sentences. Can you please check them, too? 1) “Congratulations for passing your driving test”, Peter said to me. He congratulated (me) on/for passing my driving test. 2) “I’m terribly sorry I dropped your glasses on the

  159. MATH HELP!

    i have write the equation as a single logarithm 2 lnx-3 lny+1/2 lnz

  160. Chemistry(Please check answers)

    1) The Ka for acetic acid is 1.8e-5. What is the pH of a 3.18M solution of this acid? I did 1.8e-5 = x^2/3.18 x=sqrt 1.8e-5 X 3.18 = 7.56e-3 pH=-log(7.56e-3) = 2.12 The pH is 2.12 2) At 25 degrees celsius, the pH of a 1.75M NaCN solution (the Ka for HCN is

  161. science

    what you could conclude about the temperature of Mercury based on its position in the solar system?

  162. Physics

    Sherlock Holmes examines a clue by holding his magnifying glass (with a focal length of 29.8 cm) 10.4 cm away from an object. Find the image distance. Answer in units of cm Find the magnification.

  163. Chemistry

    What is the equilibrium constant for the reaction of ammonium ion with formate ion? I know that the ionization constant for ammonium ion is Ka=5.6e-10 and for formate Kb=5.6e-11. I am not sure what to do next. Should I divide ka by kb?

  164. english

    is giving information(such as mentioning details about something that happened) considered part of ethos?

  165. italian

    I suppose this will sound wierd. Is it true that Italy, (if vampires are real) is where vampires were "founded" or in other words the "base" of vampires? what do you think? Do you believe in vampires?

  166. Chemistry

    Hemoglobin (Hb) in the blood absorbs oxygen to form oxyhemoglobin [Hb(O2)2], which transports oxygen to the cells. The equilibrium can be generally represented by the following (though it is actually composed of a series of equilibria in which Hb binds

  167. math

    9y squared + 48 - 36

  168. MATH

    tree diagra probability: tree diagram with three equal parts, what is the probability, if we spin twice of getting at least one a

  169. Accounting

    A woman would like to open a store in 8 years. She figures she will need 50,000 in capital to do so. She will make 10% on her money. a. How much would she need to invest today in one lump sum to end up with 50000 in 8 years? I got 23,325.25 b. if she's

  170. italy- 6th grade

    what are tourists attracted to in each of the three regions of italy?

  171. physics

    A mountain-climber friend with a mass of 82 kg ponders the idea of attaching a helium-filled balloon to himself to effectively reduce his weight by 25% when he climbs. He wonders what the approximate size of such a balloon would be. Hearing of your physics

  172. italy- 6th grade

    Questions 1) what environmental changes have occurred in Italy?? 2) how has the success of metal goods industries in Italy helped the country's economy? 3) what is happening to Venice? 4) describe the economic activities that make northern Italy a

  173. math situation

    please help Divide and simplify 11x-4/25/x-4/10x

  174. physics

    Steel expands 11 parts in a million for each 1 degree C change. Consider a 40,000 km steel pipe that forms a ring to fit snugly all around the circumference of the Earth. Suppose people along its length breathe on it so as to raise its temperature 0.80

  175. english essay

    can someread my essay Heart breaks are like a deep and dark December; when you just can’t find that special person in your heart, you expect it to turn into seasons like fall to winter to spring to summer. Passing through many bumpy roads I soon discover

  176. microeconomics

    potatoes chickens MICHELLE 200 PER YEAR 50 PER YEAR jAMES 80 PER YEAR 40 PER YEAR What is michelles opportunity cost of p roducing potatoes WHAT is MICHELLES OPPORTUNITY COST of producing chickens repeat same opportunitity cost for James WHICH PERSON

  177. math

    there are 5 balls in a bag.3 are white and 2 are blue. what part is white?

  178. General Science

    What is the ohms if voltage is 24 and I is 6?

  179. physics

    A uniform horizontal wire with a linear mass density of 0.48 g/m carries a 1.9 A current. It is placed in a constant magnetic field, with a strength of 3.5 10-3 T, that is horizontal and perpendicular to the wire. Neglect the magnetic field of the Earth.

  180. Calculus

    Write a slope field for the differential equation. Corporate administrators notice that 13% of their employees retire each year, while 2,500 are newly hired. What is the long term effect if they initially have 30,000 employees?

  181. physics

    Estimate the buoyant force that air exerts on you. (To do this, you can estimate your volume by knowing your weight and by assuming that your weight density is a bit less than that of water.) Assume that your weight is a about 1000 N, for example.

  182. ms. sue

    ms. sue i reply to my english post sorry it almost on other page so i post this.

  183. math

    i need help to solve an algebra question which is if liu drives for x hours,which expression gives the number of miles he willl travel?

  184. Physical Science

    what amount of energy in calories would it take to bring 20 grams of solid ice at negative twelve degrees celsius to liquid water at 100 degrees celsius?

  185. english

    is giving information(such as mentioning details about something that happened) considered part of ethos?

  186. AP Chemsitry

    A solution of an unknown monoprotic weak acid was titrated with 0.100 M NaOH. The equivalence point was reached when 37.48 ML of base had been added. From a second buret, exactly 18.74 of 0.100 M HCl were added to the titration solution. The pH was then

  187. Statistics

    At the Starlight Jewelry store, the customer preferences for wedding bands is 60% yellow gold, 29% white gold and 11% platinum. If 15 customers are randomly selected, what is the probability that more than 10 of them choose yellow gold wedding bands?

  188. Physics

    Consider a concave mirror with a focal length of 14.04 cm. b) Find the image distance when the object distance is 7.02 cm c) Find the magnification of the image for part b Giving me the formulas is just fine

  189. Math(Algebra)

    Determine whether the pair of lines are parallel, perpendicular, or neither. 1)f(x)=2/3x+1 2)2y+3x=1

  190. physics--please help

    You are traveling in a car toward a hill at a speed of 40.8 mph. The car's horn emits sound waves of frequency 243 Hz, which move with a speed of 340 m/s.The frequency with which the waves strike the hill is 254.7Hz and the frequency of the reflected sound

  191. Intermediate Algebra

    Hi another question I have please. Find the midpoint of F A B? A(6,10) B(-20,14)

  192. math 102

    The outside dimensions of a piece of framework is 24 inches by 20 inches. The area of the picture is 320 square inches. Find the width of the frame itself

  193. Chemistry

    a class reacts 50.00ml samples of 0.200 mol/L potassium phosphate solution with an excess of 0.120 mol/L lead(II) nitrate solution. Which reagent is intended to be the limiting reagent, what is he minimum volume of lead II nitrate solution required. How do

  194. calculus

    find the approximate change in z when the point (x,y) changes from (1,1)to (1.01, 0.90) f(x,y) = xe^(-y) + ye^(-x)

  195. MATH HELP

    At Jefferson College 15% of all students participate in athletics. If a class consists of 33 randomly selected students, how many of them would you expect to participate in athletics?

  196. PLEASE HELP ME...geology

    PLEASE CAN YOU HELP TO DESCRIBE BOTH. THE FELDSPAR FOUND IN GABBRO AND FELDSPAR FOUND IN GRANITE.

  197. Algebra 2

    (3x^4-5x^3+7)/(x+1)

  198. Algebra 2

    (4x^3-3x^2+7x)/(x+1/2) Quotient and remainder

  199. math

    Determine the mimimum furnace output for a 2100 sq feet modern house using the formula B=31a

  200. Trig

    Solve the equation 2sin(2x) = cos x. and Solve the equation cos^2(2x)–sin^2(2x)= (√3 / 2).

  201. physics

    Calculate Earth's force of gravity on each of two steel balls of masses 6.0kg and 12.0kg I the forces of gravity on the 12-kg ball is greater than that on the other ball, why do the two balls accelerate at the same rate when dropped?

  202. physics

    when a car goes around an 8-km track in 20-minutes. what is the average speed and velocity.

  203. English

    Thank you, Writeacher. Just a question on punctuation. “Would you like to go for a motorbike ride uphill?”, he said to me. 2) “Shall I phone Mary for you?,” said Bill. 3) “If I were you, I’d leave tomorrow morning,” he said. Is the position