Calculus (Answer Check)

88,703 results, page 55

  1. Chemistry

    The first-order rate constant for the decomposition of N2O5, 2N2O5(g) --> 4NO2(g) + O2(g), at 70 degrees C is 6.82 x 10^-3 s^-1. Suppose we start with .0208 mol of N2O5(g) in a volume of 2.2 L. How many minutes will it take for the quantity of N2O5 to drop to .014 mol? I've...
  2. Algebra

    What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in scientific notation? My ...
  3. Math

    What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in scientific notation? My ...
  4. Math

    An object at rest begins moving horizontally on the x-axis, starting at position x(t) = 0 feet at time t = 0 seconds.Suppose, after exactly 2 seconds we measure the position of the object to be 3 feet to the right of the origin AND measure the object to be moving to the ...
  5. Algebra

    Suppose a triangle has angles A,B, and C. Angle C is the right angle. Find the measures of the other sides to the nearest whole number. < means angle symbol. 1.BC=9,m<B=72 degrees I got angle AB=28 and angle AC=29 To solve these problems you find either the sine, cosine...
  6. phyiscal science

    can you help me with the first two - I have a chart of 20. Substance O - check any appropriate element - compound - symbol-formula - atom - molecule Substance O2 - check any appropriate element - compund - symbol-formula- atom - molecule
  7. geography

    1. Which country is the smallest in land area in Central America? largest? El Salvador has the smallest area. Mexico has the largest area. 2. What do Finland, Poland, Czechoslovakia, Hungary and Romania all have in common? The countries are all in Europe. Do you think my ...
  8. Math 7 - Homework Question Check (Q2)

    37. On the lines below, explain why the graph you choose is misleading? Answer - The reason why graph A was misleading is because on the left side (where the numbers are) it started from 0 to 50, then 50 to 100, AND 100 to 300! From 100 to 300 is too much, plus when plotting ...
  9. English - check my answer, please.

    "In Shakespeare's Romeo and Juliet, Juliet's mother rejected her, because of the power of Lord Capulet, and Juliet rejects the Nurse in the same scene, calling her a 'wicked fiend.'" This statement: has a subject and predicate that don't agree in number. includes a comma ...
  10. SOCIAL STUDIES (CHECK ANSWER)

    How did Spain's refusal to destroy Negro Fort affect Florida? It led General Jackson's troops first invasion of the territory It gave the seminoles an empowered stance against the United States It showed that Spain did not view General Jackson as a significant threat It proved...
  11. chemistry problem

    A carbon nucleus has six protons and six neutrons. How many electrons would it take to equal the mass of a carbon nucleus? ok. i think theres some type of formula or some trick to figure this one out but i don't know what it is. If you guys know how to figure this out can u ...
  12. calculus

    use differentials to determine by approximately how many centimeters does the diagonal of a square table increase if its area is increased from 50 square centimeters to 54.45 square centimeters? Area= s^2 Diagonal= sqrt(2s^2) so, D= sqrt(2A) dD=A^(-1/2) dA dD= 50^(-1/2)* 4.45 ...
  13. PLEASE HELP WITH CALCULUS 1 - ITS REALLY URGENT

    Velocities of the 2 cars during the race are given in the tables below where velocities, v are in miles per hour and times t are in seconds. Sappho's car: time: 0 1 2 3 4 5 6 7 8 9 10 velocity:0 20 35 48 62 75 85 93 99 106 111 Homer's car: time: 0 1 2 3 4 5 6 7 8 9 10 velocity...
  14. Algebra

    Yes. The car will travel 40 miles in an hour. A certain Car Travels 14 miles in 21 minutes. If the car continues at the same speed how many miles can it go in 1 Hour One way to solve this problem is by setting up a proportion. Let x = the miles the car can go in one hour. 14...
  15. 8 grade math

    please check my answer thanks At Albany's Children's Hospital, the hospital cenuson Jan 4 is 110 According to the following data, what's the hospital census for Jan 5 Admissions 10 Discharges 2 A&D 1 so this is what I got 110 + 10 (#of admissions) = 120 then - 2 # of ...
  16. Poem: I Hear America Singing By: Walt Whitman

    Could you check this question please? Thanks. 1. What is the significance of the poem? (i.e. what does it mean and what impact does it make on the reader?) Answer: The poem "I Hear America Singing," means that all Americans are working happily at there jobs, and working hard ...
  17. Algebra

    I have two short questions which I think I know the answer-could you please check? If I write log(b)x - 2log(b)y as a single logarithm it would be log(b) x/y^2, correct? If not please help and Is the function f(x) = 1/x a exponential function -I think it would be because it ...
  18. Biology Answer Check

    Which of the following describes the classification of humans? A. The genus Homo and the species sapiens B. The phyla Homo and the species sapiens C. The family sapiens and the genus Homo D. The class sapiens and the genus Homo i think its A Correct or Incorrect . if so which ...
  19. chemistry

    what is the net ionic equation for the following molecular equation. HNO3 is strong electrolyte and CH3COOH is weak electrolyte. NaCH3COO(aq)+HNO3(aq)----->NaNO3(aq)+CHOOH(aq) the same question says use H+ for the hydronium ion, CH3OOH for acetic acid and CH3COO for the ...
  20. Chemistry

    The equilibrium constant Kc for the following reaction is equal to 0.20 at 250°C. Calculate the equilibrium constant Kp for the reverse reaction at the same temperature. COCl2 (g) = CO (g) + Cl2 (g) My Answer: To find the reverse reaction of Kc, it should be 1/0.2 = 5, so the...
  21. Introduction to Graphic Design

    Hello! Thanks for checking my question out! ____ A small fashion boutique, J. Lollies, has an outdated logo and corporate identity. Its business is booming, but visually, the company seems to be lagging behind. The company's marketing materials desperately need an update. Use ...
  22. Methylene chloride

    Question: A sample was placed on a chromatography column. Methylene chloride was used as the eluting solvent. All of the components eluted off the column, but no separation was observed. What must have been happening during this experiment? How would you change the experiment ...
  23. Pre-Calculus

    A gardener has 72' of edging. She wants to use it to enclose a 125 square foot rectangular area; she does not have to use up all of the edging. What are the possible lengths that a side of the rectangle can have? Answer using interval notation. Hint: If the length of the ...
  24. cultural diversity

    1. Advocates of social skills building and role modeling would not be inclined to choose a Western style of play because Western play: A. Has a people focus, not an object focus B. Is impossible for many non-mainstream children to master C. Lacks a rule-based orientation. D. ...
  25. Math

    In which one of the following sentences is the number written correctly? A. One-hundred and thirty-two people lined up to buy the tickets B. John just paid $33 thousand for his new car C. The parcel of land was advetised a two hundred forty-three and three quarters acres D. ...
  26. socialstudies(check answers please)

    what was the purpose of the gettysburg address? A.to end the revolutionary war and gain independence.(I PICKED THIS) B.to launch the war for independence and american democracy. C.to honor fallin soldiers in the civil war and cement notion of equailty for all people. D.To ...
  27. Chemistry-DrBob222

    I got an answer of -1.34 x 10^3 KJ/mol. A 10.00 mL aliquot of 0.100 M NaOH is added to 15.00 mL of 0.100M HCl in a coffee cup calorimeter. The initial temperature of the two dilute liquids were both 25.0 degrees C and the final temperature of the mixture was found to be 37.8 ...
  28. Algebra: Check please!!!

    1. Find the x-intercept and the y-intercept of 8x - 2y = -24. a. x= -7, y= 2 b. x= -4, y= 14 c. x= -3, y= 12 d. x= -7, y= -2 answer: a 2. Find the x- and y- intercept of the line 2x + 3y = -18. a. x-intercept is 18, y-intercept is 18 b. x-intercept is -6, y-intercept is 9. c. ...
  29. Geometry Help?

    Can anyone check my answers? * = My answer 1. Find the length of the missing side. Leave your answer in simplest radical form (1 point) The triangle is not drawn to scale. Sides 4 on the bottom and 3 on the side a. 25 b. 144 c. 5 d. √5* 2. Find the length of the missing ...
  30. Quadratic Functions2

    Determine the standard form of a quadratic function whose graph has a y intercept of 8 and a vertex at (-2,-4). The answer is f(x)= 3x^2 + 12x +8 but I can't figure out how to get the answer. Solve x^2 + x=6, by factoring. The answer is x=-3,2 but I can't figure out how to get...
  31. calculus maths

    Hi can some one help, explain the following please. I seem to have issues with this: 1- Find the corresponding particular solution (in implicit form) that satisfies the initial; condition y = when x = 0. 2- Find the explicit form of this particular solution. 3- What is the ...
  32. Calculus

    A particle starts at the point (5,0) at t=0 and moves along the x-axis in such a way that at time t>0 its velocity v(t) is given by v(t)= t/(1+t^2). a). Determine the maximum velocity of the particle. Justify your answer. b). Determine the position of the particle at t=6. c...
  33. Calculus (math)

    A painting in an art gallery has height h and is hung so its lower edge is a distance d above the eye of an observer. How far from the wall should the observer stand to get the best view? (In other words, where should the observer stand so as to maximize the angle \theta ...
  34. calculus

    In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
  35. Art

    I urgently need you to check these sentences. Thank you. 1) Focus on Richardson’s Pamela and answer briefly the following questions. 2) What does Pamela recount to her mum in letter XV? 3) What does Mr B accuse her of and how does she apologize herself to him? 4) What does ...
  36. English

    Hi! ____ 15. Which of the following quotations from “Nolan Bushnell” best reflects Bushnell’s business and management model? (1 point) a) “Bushnell sold Atari in 1978 and left the company soon after that.” b) “Bushnell took a copy of Alcorn’s game, named Pong ...
  37. dividing a polynomial by a polynomial

    (-6v^2 - 4 + 9v +v^3)/ (v - 4)i am just a little lost can someone explain this to me. thanks. Arrange the polonomial in descending order... v^3-6v^2 +9v -4 Then divide. v-4 !v^3-6v^2 +9v -4 The first term is v^2, so v^2*(v-4) is v^3-4v^2 subtracting that from the polonomial ...
  38. Math

    A rancher is putting a fence around a square animal pen. The perimeter of the pen is 32 feet. The fence posts will be 16 inches apart. She starts by putting 1 fence post at each corner of the pen. How many fence posts does she use altogether? My solution is 32*12=384 and 384/...
  39. English - check my answer, please.

    "Our dog LuLu had broken her leash, and rounding the corner of the house, the shrub caught her in the eye." This statement: includes an inappropriate combination of modifier and noun. *** includes a passive construction-one in which the subject receives the action of the ...
  40. Social Studies - Can anyone check my answer?

    Why did Native Americans get involved in the French and Indian War? Select two answers. 1. They felt it was the only way to protect their way of life. ** 2. Europeans threatened violence against their families and forced them to choose a side. 3. They wanted to double cross ...
  41. 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 citation for information ...
  42. Physics

    An object is shot at 20m/s at an angle theta. The object lands 24m away. What is the angle? Can you check if I am doing this right? I had v(initial) = 20 m/s g = 9.8 m/s^2 x = 24m 1st I solved for time: x = v(initial) t x = v(initial) cos(theta) t 24 = 20 cos(theta) t 24 / [20...
  43. Calculus

    A donut is generated by rotating the circle, S, defined by (x-3)^2 +y^2 =4 about the y axis. If the anagement of dunkin donuts wants to know how to price these donuts use intergral calculus to help them (i) set up a definite intergral to determine the volume,V1, of a donut ...
  44. Social Studies (Check my answer plz)

    Hey, I don't understand this question... ~~What were the positions of the Federalists and Anti-Federalists on the new Constitution? Provide at least two details supporting why each side supported or did not support the new Constitution.~~ My answer was gonna be, "What were the...
  45. Honors Chemistry

    On the same subject as before with the limiting/excess reagent stuff -- can someone please check my answer to make sure I'm doing it right? Thanks sooooo much!! :DD 3. Mg + 2HCl ==> MgCl2 + H2 -- What mass of hydrogen at STP is produced from the reaction of 50 g of Mg and ...
  46. physics(check my answer)

    A 60.0 kg person bends his knees and then jumps straight up. After his feet leave the floor, his motion is unaffected by air resistance and his center of mass rises by a maximum of 14.9 cm. Model the floor as completely solid and motionless. (a) Does the floor impart impulse ...
  47. (Math)Simplifying using the laws of exponents

    I need help with a few problems. 1.) (x^3/4 times y^1/3)^2/3 How is the answer x^1/2y^2/9 2.)(x^-1/3 times y) (x^1/2 times y^-4/3) How is the answer x^1/6 over y^1/3 3.)(4a^2b^-7/2)^1/2 How is the answer 2a over b^3/4 4.) (x^2/3y^-1/3 over 8x^1/2y)^1/3 How is the answer x^1/18...
  48. Math :(

    Please help me with this. Can you explain to me how to find the answer? Multiply 3.8*10^8 by 7.2*10^-3, leave your answer in a scientific notation. 2.736*10^4 2.736*10^5 2.736*10^6 27.36*10^5 Honestly, I don't the answer to the question So please forgive the wrong answer if I ...
  49. Spanish 1

    What is the correct plural form of "una bebida popular"? A.) una bebidas popular B.) una bebidas populares C.) unas bebidas popularas D.) unas bebidas populares (my answer) Anyone check it for me please? I just want to make sure.
  50. MATH please help

    An object at rest begins moving horizontally on the x-axis, starting at position x(t) = 0 feet at time t = 0 seconds.Suppose, after exactly 2 seconds we measure the position of the object to be 3 feet to the right of the origin AND measure the object to be moving to the ...
  51. Spanish-Please check my work-Thanks

    Could someone check-I had to correctly conjugate the verbs. Mis hermanos prefieren un pastel de chocolate. Mi padre prefiere una corbata azul. Mis amigos quieren una fiesta. Yo quiero muchos regalos. Nosotros queremos una fiesta. Ellos quieren bailar. Nosotros preferimos ...
  52. French

    Could you check these also thanks: Directions: Donnez des réponses personnelles. 1. Tu vas souvent au cinéma? Answer: Oui, je vais souvent au cinéma. 2. Qu'est-ce que tu aimes comme films? Answer: J'aime un film d'horreur. 3. Quel est ton acteur préféré? Et ton actrice ...
  53. Calculus

    The temperature of a cup of Starbucks coffee at time t (in minutes) is T(t)= 70 + c e^(-kt) . Initially, the temperature of the coffee was 200 degrees F. Three minutes later, it was 180 degrees. When will the temperature of the coffee be 150 degrees F? The back of the book ...
  54. SS7R - 3 HW Question Check

    4. What were Jefferson's concerns in purchasing Louisiana? Answer - Jefferson's concern in purchasing Louisiana is that he had always insisted that the federal government had only those powers spelled out in the constitution. 5. Jefferson sent Lewis and Clark to explore ...
  55. Calculus

    Use the Shell Method to compute the volume V of the solid obtained by rotating the region enclosed by the graphs of the functions y = x^2, y = 8 − x^2,and x = 1/2 about the y-axis. Here is how I set up the integral: 2 pi integral sign [-2,2] (1/2 - x)[(8-x^2)- (x^2)]dx ...
  56. Math

    What is 0.68 written as a simplified fraction? My answer is 17/25. What makes the statement true? 7^-2= My answer is 14. What is 308,745,538 is scientific notation? My answer is 3.1 x 10^8. What is the solution to (3 x 10^2) x (5 x 10^5)written in scientific notation? My ...
  57. math

    you have deposited 1000 dollars in your savings account with n annual interest rate of 4 percent compounded monthly. how much money are you going to have in your account after six months? [(1+ 0.04/12)]^6 x 1000 = ?? is the answer 1020.164? You got it. well theres another part...
  58. math plz check ;-;

    A triangle has sides of lengths 5 cm, 5 cm, and square root 47cm. Which of the following statements is true? A. The triangle is an obtuse triangle because (√47)^2>5^2+5^2 B. The triangle is an acute triangle because 5^2<5^2+(√47)^2 C. The triangle is an acute...
  59. TO TEACHERS AND WRITEACHER

    TO TEACHERS AND WRITEACHER HELLO, I AM NEW TO THIS WEBSITE. THIS IS MY SECOND DAY IN THIS WEBSITE. THERE IS A RIDDLE FORUM ON THIS WEBSITE. I POSTED A RIDDLE ON THE RIDDLE FORUM.BUT LATER WHEN I WENT TO CHECK IF SOMEONE ANSWERED MY RIDDLE IN THE RIDDLE FORUM MY NAME AND ...
  60. Chemistry(Please check)

    Which of the following four processes are accompanied by an increase in entropy? 1. I2 (s) -> I2 (g) 2. 2 I (g) -> I2 (g) 3. 2 NH3 (g) -> N2 (g) + 3 H2 (g) 4. Pb2+ (aq) + 2 OH – (aq) -> Pb(OH)2 (s) Answers: a. 1 & 2 b. 1 & 3 c. 3 & 4 d. 2 & 4 e. only 3 I am ...
  61. Pre-Calculus

    A gardener has 100' of edging. She wants to use it to enclose a 130 square foot rectangular area; she does not have to use up all of the edging. What are the possible lengths that a side of the rectangle can have? Answer using interval notation. Hint: If the length of the ...
  62. spanish Sra JmGuin

    change verbs to prsent progressive example: (tu) escuchar escuchando 1. (ellas) dar ANSWER: estan dondo 2. (tu) beber ANSWER: estas bebiendo 3. (yo) bailar ANSWER: estoy bailando 4. (el) tomar ASNWER: esta tomando 5. (usted) traer ANSWER: esta treyando 6. (ella) leer ANSWER: ...
  63. Chemistry (URGENT)

    I have a test soon. If you can help me with these questions, that would be great. 1. Define and describe the following. a)Alkaline - metal - base b)Corrosive - burn/eat away - acid c)Caustic - harsh - both? (acid + base) d)Low pH - 0-6.99 - acid Please check my answers and ...
  64. math plz check ;-; sorry

    A triangle has sides of lengths 5 cm, 5 cm, and square root 47cm. Which of the following statements is true? A. The triangle is an obtuse triangle because (√47)^2>5^2+5^2 B. The triangle is an acute triangle because 5^2<5^2+(√47)^2 C. The triangle is an acute...
  65. statistics

    An experiment consists of rolling a die and selecting a marble from a bag. the bag has 7 orange, 3 pink, and 6 grey marbles. What is the probability of rolling a multiple of 3 and selecting a pink marble? Anwer: The two events are independent of each other, therefore we ...
  66. Statistics

    An experiment consists of rolling a die and selecting a marble from a bag. the bag has 7 orange, 3 pink, and 6 grey marbles. What is the probability of rolling a multiple of 3 and selecting a pink marble? Anwer: The two events are independent of each other, therefore we ...
  67. math

    Jake is making birdhouses to sell. The cost to make them is $80 for supplies plus $6.25 per birdhouse. He will sell them for $16 each. What is the minimum # of birdhouses he must sell to make a profit. I got he must sell more than 8 I did it by setting up 80+6.25x<16x -6.25...
  68. Economics

    14. The life-cycle hypothesis and Permanent Income Hypothesis theories of consumption: A) are attempts to discredit the Keynesian consumption theory. B) believe that consumers do not have any autonomous consumption. C) assert that consumption is a necessity of life and does ...
  69. Math/Algebra

    Please help me with this, below is a question I have to answer…below that is my answer…did I do, or answer this correctly? Post a response of at least 50 words to the following: Explain how to graph linear equations using the x- and y-intercepts. Provide an example to ...
  70. PHYSICS answer check

    a gun converts 200J of stored energy into kinetic energy of the 0.02kg bullet. a)What is the speed of the bullet as it leaves the gun? b)If the gun is fired straight up, how high will the bullet go? a)200J b)m*g*h= (0.02kg)(10m/s^2)=200J h=100m
  71. Math

    The local zoo has 3 lions, 4 elephants, 2 giraffes, 5 monkeys, and 2 zebras. What is the ratio of zebras to total animals? My Answer: I already know this 3x:4x:2x:5x:2x=16x So 16 total animals 16x=2 x=8 So then the ratio of zebras to the total number of animals is 8 Can you ...
  72. Algebra II

    I am super confused with permutations and combinations. I just don't see when you are supposed to use each one, and when you aren't supposed to use either. Our homework was to correct our tests, and I did quite poorly. I tried to fix some of these, so could someone check my ...
  73. Language Art (Please Check)

    please check....i also put the deffinitons just in case... 1.which of the following might be considered a tedious job? A.designing video games(i PICK THIS A.) B.writing an advice column C.bagging groceries 2.A person who shows bigotry is likely to have feelings of A.pride B....
  74. substitution method

    -3x+y=-5 x+2y=0 Your equations: -3x + y = -5 x + 2y = 0 Let's solve the second equation for x: x = -2y Now let's substitute -2y for x in the first equation to solve for y: -3(-2y) + y = -5 6y + y = -5 7y = -5 y = -5/7 Now let's substitute -5/7 for y in the second equation to ...
  75. Math-check my answers!!!

    Check my answers please!!!! I really don't know how to do these but I tried my best 1. Simplify. 3x^2+ 5x-5x^2-4x+5-2 A.-8x^2-9x+3 B.2x^2+x+3 C.-2x^2-9x+3*** D.-2x^2+x+3 2. Add or Subtract.(8x – 2y) + (3x – 4y) A.11x+8y B.4x-y C.11x-6y*** D.5x+2y 3.(5x^2-4x-1)-(-4x^2-4) A...
  76. english/check please

    Add an interjection to each of these sentences. Be sure to punctuate correctly. 1- Isn't that beautiful? - Ah! isn't that beautiful ? 2-We're having a test . - My goodness ! Were having a test ! 3- That hurts. - Ouch ! That hurts ! 4- I ripped my best shirt. -Wow ! I ripped my...
  77. Math

    If the length of the of a circle is 15 inches, what is the length of the radius of the circle? A. 7.5 inches** B. 15 inches C. 30 inches D. any length between 0 and 15 inches I think the answer is A. Check?
  78. Math

    If the length of the of a circle is 15 inches, what is the length of the radius of the circle? A. 7.5 inches** B. 15 inches C. 30 inches D. any length between 0 and 15 inches I think the answer is A. Check?
  79. Sample purity

    Question: A student spots an unknown sample on a TLC plate and develops it in pentane solvent. Only one spot, for which the Rf value is 0.05, is observed. Is the unknown a pure compound? What can be done to verify the purity of the sample using TLC? My answer: It's not ...
  80. Calculus

    Silly question here, but I am not getting a certain part in the solution in a problem. Evaluate the integral of [(sin(ln(39x)))/x]dx. We are supposed to take u=ln(39x), and get du=(1/x)dx, and the then whole thing is simply solved using integration formulas. But my confusion ...
  81. calculus

    Suppose that 430 ft of fencing is used to enclose a corral in the shape of a rectangle with a semicircle whose diameter is a side of the rectangle. (In the figure below, the blue outline represents the fencing.) Find the dimensions of the corral with maximum area. x=? y=? i ...
  82. Math

    Could someone check this over for me please. Arrange in order from smallest to largest 2.05, 25/10, 2.0513, 2.059, 251/100, 20515, 2.052, 2.051. Answer: 2.05, 2.051, 2.052, 2.059, 251/100, 2.0513, 2.0515, 25/10 45.6 – 8.75 Answer: 36.85 (Add) thirty-eight and nine tenths, ...
  83. Geometry

    Can someone please check these for me. I have to leave answers in Pi. Find the Volume of a right cone with radius 6 height 10 V=1/3 pi r squared*h =1/3pi (6)^2(10) =1/3(360)pi =120pi Find the volume of a sphere with radius 3cm V=4/3 pi r^3 =4/3 pi3^3 =4/3(27)pi =36pi They ...
  84. Algebra (answer check)

    The population of a small town is decreasing at a rate of 6% per year. If the town's population is 12,500 in 2017, what will the population be in 6 years? 8,623 people 8,000 people <--? or D 17,731 people 9,416 Write the equation of the line that passes through the points...
  85. Calculus

    A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another 5 miles and is going 500 mph. At that moment, how fast is the distance between the ...
  86. calculus

    4. A particle starts at the point (5, 0) at t = 0 and moves along the x-axis in such a way that at time t > 0 the velocity is given by v(t)=t/(1+t^2) a. Determine the maximum velocity attained by the particle. Justify your answer. b. Determine the position of the particle ...
  87. Calculus (math)

    A painting in an art gallery has height h and is hung so its lower edge is a distance d above the eye of an observer (as in the figure). How far from the wall should the observer stand to get the best view? (In other words, where should the observer stand so as to maximize the...
  88. English

    Could you please check if everything is correct? Thank you. 1) Thank you very much for having your students send email to their Italian partners. 2) Tomorrow I will distribute the emails to my students so that they can start the partnership. 3) Four more students would like to...
  89. Business communications 1

    which of the following is not an example of a parallel structure? 1. yoga can help you develop flexibility, reduce stress, and increase relaxion. 2. Learn hot to analyze business audiences, improve your style, and edit thouroughly. 3. you are all encouraged to come and share ...
  90. Calculus

    The function y=Asin (sqrt(k/m)t) represents the oscillations of a mass m at the end of a spring. The constant k measures the stiffness of the spring. 1. Find the first positive time time t1 at which the mass is farthest from its equilibrium position: t1=_________________ 2. ...
  91. Big MATH Help needed

    An object at rest begins moving horizontally on the x-axis, starting at position x(t) = 0 feet at time t = 0 seconds.Suppose, after exactly 2 seconds we measure the position of the object to be 3 feet to the right of the origin AND measure the object to be moving to the ...
  92. SS HELP PLZ ASAP

    1) The science that studies population distribution and change is called _________(1 point) A. demography B. geography C. economy D. sociology 2) Canada is bigger than the united states, but only has _______ as many people.(1 point) A.one-half B.one-fourth C.one-eighth D.one-...
  93. Programming in c++

    Draw a flow-chart and Write a program that asks the user to enter students grades. The program should stop reading when the use enters ‘*’. In addition, your program should print the number of students got each grade. The grades can be A, B, C, D, and F. You should check ...
  94. Check 1 question.

    Help please!i'm not sure if i'm right. Honestly i'm not that confident about most of my work. In which of the following thermochemical equations would the deltaH be considered a heat of solution? C6H6 (s)--> C6H6 (l), deltaH = +9.87 kJ 2C8H18(l) + 25O2 (g)-->16CO2 (g) + ...
  95. math

    can you check my answers? i have to write the clop intercept form of the equation key (a= means answer is) 1. 3x-2y=12 a= 3/2x-6=y 2. x+y=7 a= y=-x+7 3. -13+6y=x a= y=x/6+13/6 4. -2y=24+6x a= y=-3x-12 5. 49x-y=558 a= y=49x-558 6. 3x+14y=-56 a= y=-3/14x-4 7. -1/6y-1/6=x a= y=-1...
  96. algebra

    can you check my answers? i have to write the slope intercept form of the equation key (a= means answer is) 1. 3x-2y=12 a= 3/2x-6=y 2. x+y=7 a= y=-x+7 3. -13+6y=x a= y=x/6+13/6 4. -2y=24+6x a= y=-3x-12 5. 49x-y=558 a= y=49x-558 6. 3x+14y=-56 a= y=-3/14x-4 7. -1/6y-1/6=x a= y=-...
  97. Physics - Potential difference (check + help)

    A pair of horizontal plates are situated in a vacuum and separated by a distance of 1.8cm. What potential energy would need to be connected across the plates in order to hold a single electron suspended at rest between them? Ans: I used the formula (qv)/d = mg ; where q=is the...
  98. Social Studies

    Which statement best describes the framework of government established by the Constitution? A. The three branches of government defer the majority of power to the states B. A system of checks and balances keeps each of the three branches from having too much power C. The ...
  99. math calculus (please help me)

    In 1970, the total enrollment in public universities and colleges in a country was 5.1 million students. By 2004, enrollment had risen to 14.3 million students. Assume enrollment can be modeled by exponential growth. (a) Estimate the total enrollments in 1980, 1990, and 2000...
  100. calculus

    A rectangular area is to be enclosed and divided into thirds. The family has $400 to spend for the fencing material. The outside fence costs $10 per running foot installed, and the dividers cost $20 per running foot installed. What are the dimensions that will maximize the ...
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