Calculus (Answer Check)

88,560 results, page 67

  1. Chemistry - please help

    Hi, please check my work: In an experiment, 23.4 g of FES are added to excess oxygen and 16.5 g of FE2O3 are produced. The balanced equation is: 4FeS = 7O2 --> 2Fe2O3 + 2SO2 Calculate the % yield. My Answer: nFeS=23.4g/87.92 g/mol =0.266 mol 4mol FeS / 0.266 mol = 7mol O2/ ...
  2. Chemistry - please help

    Hi, please check my work: In an experiment, 23.4 g of FES are added to excess oxygen and 16.5 g of FE2O3 are produced. The balanced equation is: 4FeS = 7O2 --> 2Fe2O3 + 2SO2 Calculate the % yield. My Answer: nFeS=23.4g/87.92 g/mol =0.266 mol 4mol FeS / 0.266 mol = 7mol O2/ ...
  3. Spanish

    Each of the Spanish sentences below is incorrect in either grammar or meaning. Rewrite each sentence correctly 1. El rey que canta está tocando el tambor. The king that used to sing is playing the drum. Can you check my answer: El rey que cantaba está tocando el tambor. 2...
  4. Business Calculus

    As the financial consultant to a classic auto dealership, you estimate that the total value (in dollars) of its collection of 1959 Chevrolets and Fords is given by the formula v = 306,000 + 1,000t2 (t ≥ 5) where t is the number of years from now. You anticipate a ...
  5. math, correction,plz

    Can someone correct these for me..plz... Problem #1 simplify. ((p^5)^4)/(p^6) MY answer: p^14 Problem #2 Write using positive exponents only. b^-6 MY answer: (1)/(b^6) Problem#3 Write 1.81 X 10^-2 in standard notation My answer. 0.0181 Problem #4 Subtract 2x-3x^2+5x^3 from 5x^...
  6. Chemistry

    The freezing point of benzene is 5.5°C. What is the freezing point of a solution of 8.50 g of naphthalene (C10H8) in 425 g of benzene (Kf of benzene = 4.90°C/m)? I worked this problem for someone just a couple of days ago. delta T = kf m kf = 4.90 m = molality = mols/kg. ...
  7. algebra

    (2x+3)/5 = -(3x-2)/2 - (-3/2)(-3/2) I've done this problem a few times and keep getting -37/38 which seems like a dumb answer to the problem. I know I think the answer should be a whole number so I don't know if that's what's confusing me. Is my answer right?
  8. math

    sums and differences of rational algebraic expression answer the following 2x/x^2-2x-15 - x-2/3x^2+9 another is t/2rs^2 - 2r/3rst + 3s/30r^2t another is 3x/2x-3 - 2x/2x+3 + 3/4x^2-9 please answer this i need it tomorrow morning 3:00 please answer it i will WAIT FOR IT!
  9. Physic

    The position of a mass on a spring is given by x = (7.6 cm) cos [2 π t / (0.82s)]. Where is the mass at t = 3.1 s? (Answer: 1.45cm) Answer is provided above. Please show all work on how to get the answer. Thank you.
  10. English

    Write his, her, their, or its to should which pronoun you should use. 1. each neice: ______ answer: their 2. Jane, Ann, or Wilma ___ answer: their 3. either Brian or Kevin ____ answer: their
  11. english

    hypothetical syllogisms can have two valid and two invalid structures. The two valid structures are affirming the antecedent or modus ponens and denying the consequent or modus tollens. The two invalid structures or fallacies are denying the antecedent and affirming the ...
  12. Math

    what is the solution to x + 4 = 12? A. X = 16 B. X = 12 C. X = 8 (MY ANSWER) D. X = 4 What is the value of b is 9 + b = -8 A. b = -17 B. b = -1 C. b = 1 D. b = 17(MY ANSWER) What is the solution to q + (-9) = 12? A. q = -21 B. q = -3 C. q = 3 ( MY ANSWER) D. q = 21 Are my ...
  13. Spanish-SraJMcGin please check

    1.¿Comó te sentiste ayer? Yo sentí muy bien. 2. ¿Adonde fuiste ayer? Yo fui al cine. 3. ¿Adonde fue tu mama ayer? Mi mama fue a la tienda. 4. ¿Visitaste a tu familia la semana pasada? Sí, yo visité mi familia la semana pasada. 5. . ¿Donde estudiaste ayer? Yo estudié ...
  14. Physics

    please can u check my answer Here are the questions: 1. A 0.45 kg book is resting on a dessktop 0.64 m high. Calculate the book's potential energy relative to a)the desktop? b)the floor. 2. A 0.636 kg basketball has a potential energy of 19J at the basket. How high is the ball...
  15. Algebra

    1. What is the equation for the line that passes through the point (-5,2) and has a slope of 0? Answer-2 2. What is the slope of the line that passes through the points (-2, 4, 15) and (1, 1.24)? Answer- -2.91 3. Write a funciton rule for the table shown x 2 3 4 F(x) 8 27 64 ...
  16. Mathematic

    2/(2/3)+3/4/(4/5)= The answer key explains it like this: 2/(2/3)+3/(3/4)+4/(4/5)=2x3/2+3x4/3+4x5/4= 3+4+5=12 *I do not understand how the answer is 12. If 2/5 of (2/3)/(5/6) is divided by 3/10, what is the resulting value? The answer key explains it like this: 2/5((2/3)/(5/6...
  17. Geometry

    What is the circumference of the circle if the radius is: 5x-My answer was 57(x)pi. What is the radius if the circumference is: 30x(pi)-My answer was 2x. (x + y)pi -My answer (x+y)/7. What is the length of the arc if: radius=3 degree of measurement of arc=6- My answer was pi/9...
  18. Reading, please quickly check my 2 answers.

    The speaker in "Dream Variations" longs to "rest at cool evening," which is an expression of the human need for personal expression a place in the jungle a sense of safety warmth and brightness My answer is D The theme of Countee Cullen's poem "Any Human to Another" is that ...
  19. Fused Sentence

    How do I re-write this sentence using the fused sentence format? See below The creature sat upright and tugged at the shackles binding his ankles, Frankenstein uttered a piercing scream. Check this site for ideas about how to rewrite that sentence. Then post your rewritten ...
  20. Social Studies/American Government

    Could you check my answers by the way they have to do with the Missouri State Missouri State Constitution. Missouri State Constitution. 1. What is the Preamble? Answer: The Preamble is the first paragraph of the Constitution, and it states why the Constitution was written. 2. ...
  21. 5 QUESTIONS PLZ HELP!

    1) which of the following numbers are equivalent to 20%?(Choose all that apply)(only 2) A. o.oo2 B. 1/4 C. 0.20 D. 1/5 2)which of the following numbers are equivalent to 35%?(choose all that apply)(only 2) A. 7/20 B. 6/20 C. 3.5 D. 0.35 3) which of the following numbers are ...
  22. Pre-Cal(Please check)

    1) Find the Asymptotes: y = -2 sec 2pi x pi/2b and 3pi/2b pi/2(2pi) = pi/4 and 3pi/4 Is this correct? 2) Find the period and asymptotes: y = 1/2 sec pi x / 2 b = pi/2 I do not know how to find the period of asymptotes for this one. My original answer was 1 for the period and ...
  23. HISTORY

    WHAT WAS THE NAME OF THE FIRST CONFEDERATE PRESIDENT? Thank you for using the Jiskha Homework Help Forum. That was Jefferson (Jeff) Davis. what is at the bottom of sparta's social group? Check this site for your answer. http://www.sfusd.k12.ca.us/schwww/sch618/...
  24. Calculus-Steve

    Find the area of the region between the graphs of f(x)=3x+8 and g(x)=x^2 + 2x+2 over [0,2]. I got 34/3. Calculus - Steve ∫[0,2] (x^2+2x+2) dx = 1/3 x^3 + x^2 + 2x [0,2] = 8/3 + 4 + 4 = 32/3 Why are you taking the antiderivative of x^2 +2x+2 when we are trying to find the...
  25. Social Studies

    1. How did mechanization change the agricultural industry? (Choose all that apply. 1. it increased production of crops 2.it caused the cotton industry to decline 3.made dairy products safer to consume 4.caused a decrease in efficiency 2.which of the following are aspects of ...
  26. Concentration increase

    Question: What would happen to the Rf values of the pigments if you were to increase the relative concntration of acetone in the developing solvent? Note: The development solvent used was 70% hexane - 30% acetone. My answer: Acetone is more polar than hexane so the increase in...
  27. English 10 Check

    Below, you will find a list of sentences. After each sentence, select true if the topic of the statement is suitable to form the basis of a single persuasive paragraph. If the topic of the statement in your textbook is unsuitable for a single persuasive paragraph, select false...
  28. Probability (Pre-Calculus)

    A class is given a list of eight study problems from which five will be part of an upcoming exam. If a given student knows how to solve six of these problems, find the probability that the student will be able to answer: (a) all five questions on the exam. (b) exactly eight ...
  29. English expression

    Let's play the 'who is it' game, in which the appropriate person stands up. Class, first, stand up. I will ask you questions. If your answer is 'Yes, I do' or 'Yes, I am', you should remain standing. However, if your answer is 'No, I'm not' or 'No, I don't', you should be ...
  30. accounting

    On May 31, 2011, James Logan Company had a cash balance per books of $6,781.50. The bank statement from Farmers State Bank on that date showed a balance of $6,404.60. A comparison of the statement with the cash account revealed the following facts. The statement included a ...
  31. business

    On May 31, 2011, James Logan Company had a cash balance per books of $6,781.50. The bank statement from Farmers State Bank on that date showed a balance of $6,404.60. A comparison of the statement with the cash account revealed the following facts. The statement included a ...
  32. math

    On May 31, 2011, James Logan Company had a cash balance per books of $6,781.50. The bank statement from Farmers State Bank on that date showed a balance of $6,404.60. A comparison of the statement with the cash account revealed the following facts. The statement included a ...
  33. geometry

    When I tried answering a problem then looked at the answer in the back of my book, I was confused how to get to the correct answer. The problem is there is a trapezoid on a coordinate plane that is centered at the origin. The coordinates of the points have variables: T(-a,0), ...
  34. History

    Hai! Anyone Please Check This Answer Please! Which of the following is the most likely reason why many Mexicans were opposed to American investment in their country? A. American leaders overthrew the successful government of Porfirio Díaz.* B. Many Mexicans wanted to invest ...
  35. help!

    Can you please give me one of them so I cansolve for the other one?PLease! The general formula for a straight line is y = mx + b. Just plug the points into the equation to arrive at two equations. 6=2m+b 10=4m+b you have two equations and two unknowns. Solve them ...
  36. Chemistry

    How many grams of dry NH4Cl need to be added to 2.10L of a 0.600M solution of ammonia,NH3 , to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8x10^-5. I just wanted to make sure I dd this write, can you please check my work? Thank you!!!! I found the pKa ...
  37. Algebra

    1. Compare the quantity in Column A with the quantity in Column B. Column A slope of y = 2x +2 Column B slope of 2y = 3x +9 Answer-Column A is greater 2. |x-4| < 3 Answer- 1< x < 7 3. Solve for x in 3x + 4 =28 Answer-8 4. An algebraic ___________ has an equal sign. It...
  38. physics

    Vector V1 is 8.58 units long and points along the -x axis. Vector V2 is 4.45 units long and points at +40.0° to the +x axis. (a) What are the x and y components of each vector? V1x = Incorrect: Your answer is incorrect. V1y = Incorrect: Your answer is incorrect. V2x = ...
  39. calculus

    a) Let f(z) = z^2 and γ(t) = 1 + it^3, t ∈ [0,1]. i) Write out the contour integral ∫γ f(z)dz as an integral with respect to t. You do not need to evaluate this integral. ii) Evaluate the integral ∫0,1+i z^2dz iii) What is the relationship between ...
  40. Calculus

    the grand canyon is 1600 meters deep at its deeoest point. a rock is dropped fromthe rim above this point. Express the height of the rock as a function T in seconds. how long will it take the rock to hit the canyon floor? H= 1600-1/2t^2 thats what i got as a function is that ...
  41. math

    A bag soccer balls contains 8 balls with black design and 7 balls with red design with no other types of soccer balls. Coach graves reaches into the bag and randomly pulls out two soccer balls. please check my answer a) explain these events are either dependent or independent...
  42. Physics - Charges at an angle (check + help)

    Three charged objects are located t the vertices of a right triangle. Charge A (5*10^-6) has Cartesian coordinates (0,4; Charge B (-5.0*10^-6) is at the origin; charge c (+4.0*10^-6) has coordinates (5,0), where the coordinates are in meters. What is the net force on each ...
  43. Check my physics

    Would you mind checking one of my problems from my physics study guide? I know the answer and just want to make sure I am using the right formula. :) A 78-kg skydiver has a speed of 62 m/s at an altitude of 870 m above the ground. a. Determine the kinetic energy possessed by ...
  44. Calculus - Damon

    Find the line which passes through the point (0, 1/4) and is tangent to the curve y=x^3 at some point. So I found the derivative which is 3x^2. Let (a, a3) be the point of tangency. 3x^2 = (a3 - 1/4)/(a-0) I'm not sure how to solve for a. Yes, the point is (0,1/4) but it's not...
  45. Physics/Math

    In a pickup game of dorm shuffleboard, students crazed by final exams use a broom to propel a calculus book along the dorm hallway. If the 3.6 kg book is pushed from rest through a distance of 0.90 m by the horizontal 22 N force from the broom and then has a speed of 1.60 m/s...
  46. English

    I still have a few questions to check. I really hope you can check them. Thank you! 1) Which metaphors does the poet use to address the urn in the first stanza? 2) How is the urn described? What figure of speech is used in line one and two “Heard melodies are sweet, but ...
  47. Can u check my answer? U.S History

    "I consider the foundation of the Constitution as laid on this ground: That "all powers not delegated to the United States, by the Constitution, nor prohibited by it to the States, are reserved to the States or to the people." [10th Amendment] To take a single step beyond the ...
  48. chem (Check)

    The Question: Why must a calculated answear generally be rounded? My Answear: A calulated answear cannot be more precise than the least precise measurement from which it was calculated. I think your answer is ok but I think you are leaving out information that should be ...
  49. programming logic

    The Banking e-Teller system allows bank customers to perform ATM transactions from their cell or smart phones. BET will allow customers to check balances, make remote photo capture check deposits, and perform balance transfers to their checking or savings account. It is time ...
  50. programming java language

    For faster sorting of letters, the postal service encourages companies that send large volumes of mail to use bar code denoting the ZIP code (see figure below). Student XXXX PO Box 34689 Jeddah 21478 KSA There are full height frame bars on each side. The five encoded digits ...
  51. Chemistry

    We have been getting numerous questions like this on assignments and I can't figure them out. Its like I know that there some way connected but I can't figure it out. This is for Chemistry in highschool and its likea review and so they are not going over it but I would still ...
  52. Science

    Type one and Type three survivorship curves indicate populations that are growing _______________. Please check your assigned reading and post your answer. We'll be glad to help you when we see your thoughts about this subject. fast? fast? http://www.britannica.com/eb/article-...
  53. science

    i do not understand how to answer the question if it has (N) instead if saying (kg) how would i answer, and the question is.: if the net force is 100N, and the acceleration is 5m/s squared how much mass am i moving? please answer soon!! Thank You!!
  54. math

    please answer this my topic is all about sums and differences of rational algebraic expression perform the indicated operation reduce answer to lowest term 3/5 + 4/5 another is x/3 - y/3 another is 7/a + 2/a please answer it thanks!!!!!
  55. algebra

    I need to know if I am doing this problem right when sustitution method. y+2x=3 y+2x=-4 y+2x=3 -1(y+2x=3)-y-2x=-4 now add the two equation y-2x=3 -y-2x-4 the answer would be -4y=7 then divided -4=7 answer 1.75 I no that there is more to this answer I am just stuck and not sure...
  56. algebra

    I need to know if I am doing this problem right when sustitution method. y+2x=3 y+2x=-4 y+2x=3 -1(y+2x=3)-y-2x=-4 now add the two equation y-2x=3 -y-2x-4 the answer would be -4y=7 then divided -4=7 answer 1.75 I no that there is more to this answer I am just stuck and not sure...
  57. Math

    I have the problem: A triangle has a base of 3.6 cm and an area of 22.32 cm squared. What is the height of this triangle. The teacher gave us the answer key and I know the answer is 12.4 but I don't know how they came to that answer. I can't figure out how you are supposed to ...
  58. algebra PLEASE HELP ASAP

    1. the probability of a basketball player hitting a foul shot is 1/3. how many shots would you expect her to make in 90 attempts. a. 30 b. 60 c. 3 d. 45 my answer is b? 2. simplify 8P3. a. 42 b. 336 c. 40,432 d. 56 my answer is d? 3. how many ways can 4 students be chosen from...
  59. Grammar

    Circle the nouns that can be used with the verbs on the right . Engine-consumption-dependence (reduce) Answer : consumption and dependence Solution-dependence-alternative (find) Answer:solution and dependence Resources-technology-stocks(deplete) Answer:Resources and technology...
  60. Chemisty (Sig Figs)

    Each of the following numbers was supposed to be rounded to two significant figures. For each one below, decide whether it was correctly rounded or not, and for those that were incorrectly rounded, correct them. (a) 3.149 e3 to 3.2 e3 Its incorrect but I don't know the correct...
  61. Math

    There are 20 question in a quiz. 5 marks will be given for a correct answer. 1 mark will be deducted for a blank answer and 3 marks will be deducted for a wrong answer. (a) Peter gives 2 blank answers and he gets 72 marks. Find the number of correct answers he get. (b) Is it ...
  62. Spanish-Please check

    1.¿Comó te sentiste ayer? Yo sentí muy bien. 2. ¿Adonde fuiste ayer? Yo fui al cine. 3. ¿Adonde fue tu mama ayer? Mi mama fue a la tienda. 4. ¿Visitaste a tu familia la semana pasada? Sí, yo visité mi familia la semana pasada. 5. ¿Donde estudiaste ayer? Yo estudié al...
  63. English

    (1) Are you doing any volunteer work? How about your friends? 1. Yes, I am. They are doing (some) volunteer work, too. 2. No, I'm not. They are not doing (any) volunteer work, either. (2) Do you do any volunteer work? How about your friends? 1. Yes, I do. They do (some) ...
  64. Calculus

    I don't know limits fairly well. The problem is prove the limit using definition 6, lim x -> -3, 1 / (x+3)^4 = infinity. The books definition for definition 6 is, let f be a function defined on some open interval that contains a, except possibly at a itself, then lim x ->...
  65. Chemistry. Please Check!

    What would the coefficient be for the produced salt in a balanced chemical equation of this acid and base? HNO3 + Ca(OH)2 -->Ca(NO3)2 + H2O What would the coefficient be for the produced salt in a balanced chemical equation of this acid and base? H2SO4 + KOH -->K2SO4 + ...
  66. Check my physics answer

    When should you express a vector along the x-axis as a negative vector? when its magnitude is less than 1 when the arrow representing the vector would point toward negative x when the arrow representing the vector would point toward positive x when its magnitude is greater ...
  67. calc

    On January 1, 2013, at a price of x dollars, the demand for a certain product was D(x) = 300 x2 + 10px thousand units per month. t months after January 1, 2013, it is estimated that the price of the product will be x(t) = 3t4/3 +16 dollars. At what rate is the demand changing ...
  68. math,correction

    Multiply. (x+2)(x-2) my answer is: x^2-4 Factor completely. 3(x-2)^2-3(x-2)-6 MY answer: 3(x-4)(x-1) Factor 9x(x-7y)-6(x-7y) My answer is: (9x-6)(x-7y) Divide: (x^3+2x^2+x+12)/(x+3) My anwer is: x^2-x+4 Looks OK!
  69. English

    Please check my answers relating to predications. Our resolutions should begin at midnight on January 1. Answer: Implementing our resolutions should begin at midnight on January 1. The reason for the cat’s illness is because she was allergic to the dog. Answer: The reason ...
  70. statistics

    Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...
  71. Statistics

    Does studying for an exam pay off? The number of hours studied, x, is compared with the exam grade received, y. x 7 7 5 5 7 y 95 90 75 85 95 (a) Complete the preliminary calculations: SS(x), SS(y), and SS(xy). Incorrect: Your answer is incorrect. . (SS(x)) Incorrect: Your ...
  72. Chem Check Please!!!

    1) Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10^-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as follows: Zn2+(aq) + 2 e– -> Zn(s...
  73. physics

    A mover pushes a couch a distance of 4 m to the top of a ramp into the back of a truck using 500 N of force. A) What is the work input of the mover? B) What is the mover’s power if the task takes 10s? C) If the mass of the couch is 100 kg and the back of the truck is 1.5 m ...
  74. Calculus

    Integrate: x/(9+x^4)dx
  75. Calculus

    lim--h>0 f(x+h)- f(x/h
  76. Calculus

    If a, b, and c are digits for which 7 a 2 -4 8 b =========
  77. Calculus

    If a, b, and c are digits for which 7 a 2 -4 8 b =========
  78. Calculus

    What is the derivative of e^cx ?
  79. Calculus

    integrate: (x^2 + 1)^k dx
  80. Calculus

    What is the derivative of t^3/3
  81. Calculus

    The derivative of f of x f(x) = x^3 + 19 ; x = 8
  82. calculus

    Integrate: dx/(2x^2 + 4x + 7)
  83. calculus

    derivatives. f(x)=(1/-7x^12) f'(2)=? f'(-1)=?
  84. calculus

    if dy/dx= (1+lnx)y and if y=1 when x=1, then y=
  85. calculus

    how do you integrate x^2/(9+x^6)
  86. calculus

    how do you integrate x^2/(9+x^6)
  87. calculus

    cos(xy)+y=2
  88. Calculus- please help

    Let f(t)=(t^2+3t+8)(2t^2+6). (a) f'(t)= (b) f'(4)=
  89. pre-calculus

    3(4^x)-2^(x+2) = -1
  90. Calculus

    Find (fg)'(1) if f(1)=1, g(1)=2,f'(1)=3, g'(1)=-3
  91. calculus

    (f o g)(3x^2) << question ...f=4x-10 g=2x^2
  92. Calculus

    solve:(x^4)-(4x^2)+3=0
  93. calculus

    how to simplify: ((9^x * 3^2 * (1/3^-x)) - 27^x ) / 3^(3x) * 9
  94. calculus

    If f(x) = x2 / (4 + x), find f ''(5).
  95. Calculus

    If d/dx(f(3x^5))=9x^4 Find f'(x)
  96. calculus

    what is the derivative of 1/x??
  97. Calculus

    differentiate y = (x + 2) / (x^3 + x - 2)
  98. Calculus

    how do I know if the series ln(n)/(2n) is DV or CV?
  99. pre calculus

    27^8x-3=(1/81)^8x-4 x=?
  100. calculus

    how do you integrate dx/(x^2*(x^2+4)^1/2)
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