Nick

Questions and answers by visitors named Nick

Questions

  1. If f(x) = sin(7 − 5x), find f′(π), which is the derivative at π:

    −0.754 −0.657 0 0.657 3.770 I chose 0.657 ... I did not really get this exact answer, its just that while I was trying to figure this out my answer was actually 0.6978 but I just

  2. Find consumer's surplus at the market equilibrium point given that the demand function is p = sqrt(324−60x) and the supply function is p = x+9

  3. Some say that the hot air balloons with which the Montgolfier brothers performed their first flight had a volume of 1700 cubic metres and could lift 780 kilograms (that includes the balloon, basket and payload). Assume that the balloon took off on a day

  4. In the questions below P(x,y) means “x and y are real numbers such that x + 2y = 5”.

    a) Determine whether the statement ∃x∀yP(x,y) is true. b) Negate the statement ∃x∀yP(x,y).

  5. A father and his son can clean the house together in 7 hours. When the son works alone, it takes him an hour longer to clean than it takes his dad alone. Find how long it takes the son to clean alone

  6. Suppose that, on a day when the outside temperature is 15 degrees Celsius, we fill a balloon with pure nitrogen gas, of which the molar mass is 28 grams per mole. Now suppose that we want to heat up a second (equally large) balloon containing air, such

  7. From the position vs time graph of an object moving with constant acceleration,

    how could you find the velocity

  8. A chemist wants to make 150 mL of a 1.26 M solution of carbonic acid to be used in the lab. How many grams of H2CO3 does the chemist need to make this solution? I converted mL to .150L, multiplied .150*1.26= =0.189 to get mol. H2CO3=62.028 so I multiplied

  9. At some point in the combustion cycle of an engine, the temperature of a combusted air-fuel mixture is 582 degrees Celsius. Given that the pressure in the mixture is 6.2 bar, determine the density of the mixture (in kilogram per cubic metre).

  10. What is the pH of 6.6 X 10^4 M HCL?

  11. Given the following equation:

    2KClO3---> 2KCl+3O2 How many moles of O2 can be produced by letting 12.00 moles of KClO3 react?

  12. On a print with a scale of 1/2=1FOOT HOW much would a 20 ft hallway be in inches?

  13. What is 26cm:4m ratio in simplest form?

  14. A spring has a spring stiffness constant, k, of 420 N/m .

    1. How much must this spring be stretched to store 30 J of potential energy?

  15. A steady horizontal force F if magnitude 21N is apllied at the axle of a solid disk. the disk has mass 2.0kg and diameter of 0.10m. What is the linear speed of the center of the disk after it has moved 12m?

  16. A person who is afraid of heights likely suffers from ( select all that apply )

    a)anxiety b) a phobia c) obsessive-compulsive disorder d) an impulse control disorder Would Someone Please Help Me With The answer I Know One Is Phobia But I Don't Know The

  17. At a swim meet, a parent is videotaping his son from a seat in the stands that is 20 meters past the starting line and 8 meters away from his son's lane. Let x represent the distance the son has swum.

    a. Write x as a function of (theta). b. At what angle

  18. you are buying beads and string to make a necklace. the string coast $1.50 a pack of 10 decorative beads costs $0.50 and a pack of 25 plain beads costs $0.75 you can only spend $7.00 and you need 150 beads you wish the necklace to be as decrative as

  19. I need answers for the Unit 4 Lesson 12: Energy Unit Test in science because I need to study for it.

  20. Using separation of variables, solve the following differential equation with initial conditions dy/dx = e^(2x+3y) and y(0) = 1.

    Hint: use a property of exponentials to rewrite the differential equation so it can be separated

  21. Kenny wants to invest $250 every three months at 5.2%/a compounded quarterly. He would like to have at least $6500 at the end of his investment. How long will he need to make a regular payments?

    *PLEASE SHOW WORK*

  22. Identical twins often have similar interests even if they were not raised together. This shows how ________ influences personality development

    a) modeling b) a peer group c) environment d) heredity d would someone check this answer.

  23. Sketch the region in the first quadrant enclosed by y=6/x, y=2x, and y=12x. Decide whether to integrate with respect to x or y. Then find the area of the region.

  24. Yo fue al dentista la semana pasada

    Pablo corrio el perro y su por parque ellos leyo periodicos tres cada dia Dona Rita supo la historia de nunca la verdad

  25. Suppose that a party balloon is spherical, has a radius of 16 centimetres and is filled with helium. Furthermore suppose that we do our experiment under standard atmospheric conditions, when the air density is \(\rho = 1.225 kg/m^3\). How many of these

  26. A lighthouse is located on a small island 4 km away from the nearest point P on a straight shoreline and its light makes three revolutions per minute. How fast is the beam of light moving along the shoreline when it is 1 km from P? (Round your answer to

  27. A box contains 55 balls numbered from 1 to 55. If 8 balls are drawn with replacement, what is the probability that at least two of them have the same number?

  28. What is the molarity of KOH in a solution that has pH of 10.0?

  29. If the fish population, p, in a lake can be modelled by the function p(t)=15(t^2+30)(t+8), where t is the time, in years , from now.

    How do I determine the rate of change when the population when there are 5000 fish in the lake?

  30. Three neighbors are sharing a rectangular strip of land fir a garden. They divide the land into 24 equal-sized pieces. What fraction of the land does each person get if they share it equally? Write the answer in more than one way

  31. <b>Titanium metal has a body-centered cubic unit cell. The density of Titanium is 4.50 g/cm^3. Calculate the edge length of the unit cell and a value for the atomic radius of titanium.</b>

    Ok, I know how to find the density using the atomic radius, but I'm

  32. A certain car is about 100in. long and 60 in. wide. You plan to make a model of this car that is 9 in. wide. How long will your model be?

  33. So not a question, but if y'all want to respond to this thread with your socials, then feel free. If not, I also understand, so I will put mine.

    My name is Nicholas or Nick I'm in 10th grade, age 16, male student. With A's in all classes except one which is

  34. The base of a triangle is numerically 3 less than its area, and the height is numerically 6 less than its area. Find the area

  35. When 4x²+7x-5 is Subtracted from 9x²- 2x +3

  36. A tringle has vertices a (-1,3,4), b(3,-1,1) and c(5,1,1). What is the abc area

  37. A +3 c charge us near a +6 c charge . If the force acting in the +6 charge is now 30N , how much force must be acting on the +3 charge?

  38. Na2SiO3+8HF --> H2SiF6+2NaF+3H2O

    How many moles of HF are needed to react with 0.30 moles of Na2SiO3

  39. Write a polynomial of least degree with real coefficients and with the root

    –5+13𝑖

  40. How can I identify what clauses are adverbs, adjectives, and noun clauses. Please answer with an example for each of them.

  41. The fact that all into an architecture share similar design principles suggest what in Incan value

  42. Id like to thank all of the employees of Jiskha for a lot of reasons. You've helped me learn that you can't cheat your way out of things. I was once banned for spamming and getting answers. ( I think ) So thank you for making me realize that cheating is

  43. One mole of a gas is expanded under a constant pressure of 20 kPa, from 0.5m cubed to 0.75m cubed. how much work was performed by the gas?

  44. Neon exists as a monatomic gas. There are 1.5 mols of neon in a light bulb at a temperature of 75 degrees Celsius.

    a. what is the average kinetic energy of the neon atoms? b. what is the total kinetic energy of all of the atoms?

  45. A certain cylindrical tank holds 20,000 gallons of water, which can be drained in 20 minutes. The volume V of water remaining in the tank after t minutes is given by the functioin

    V(t)=20,000(1- (t/20))^2, where V is in gallons, t=0 represents the instant

  46. Can you help me edit this essay?

    "Should I just quit?” Is a question I keep asking myself as I try to learn a new trick. I always had a tendency to give up. I never seem to find the things that I’m good at. But after putting time and effort into the

  47. What is maginitude of acceleration?

  48. All of these are possible postural deviations in the frontal plane EXCEPT (Multiple answers can be correct. Select all that apply):

    A) Genu valgus B) Hip drop C) Genu Recurvatum D) Toe out E) All are in the frontal plane

  49. You borrow $200. The simple interest rate is 12%. You pay off the loan after 2 years. How much doe you pay for the lone

  50. The perimeter of a rectangle is 122 cm. The length is ten more than twice the width. What are the dimensions?

  51. Sophia wrote her name in block letters. She colored 1/2 of the letters yellow. She drew blue dots on 2/3 of the yellow letters. What fraction of the letters are yellow with blue dots? Express your answer in simplest form.

  52. How many molecules of water are produced from the reaction of 140 g of sulfuric acid and 180 grams of sodium hydroxide?

    How many grams of excess reagent will be left over? How many moles of sodium sulfate will be produced from this reaction?

  53. How many molecules of water are produced from the reaction of 140 g of sulfuric acid and 180 grams of sodium hydroxide?

    How many grams of excess reagent will be left over? How many moles of sodium sulfate will be produced from this reaction?

  54. Identify the complete subject . Some simple procedures protect the conditions of the forest.

  55. **PLEASE ANSWER ASAP** Nemo the clownfish got lost and ended up 1,050 miles away from his dad Marlin. Marlin swam 16 hours a day for 5 days to try and find his son. The first 2 days, he swam at a rate of 8 mph. Then he met Dory with slowed down his pace to

  56. A worker record the temperature T°C at various time on a certain winter day. He found that the temperature was 5°C, 8°C and 7°C at 2 hours, 4 hours and 6 hours after 9 am respectively. Find an expression for T at time T hours after 9 am.

  57. A contest sets out 20 unmarked envelopes. Two of those envelopes include a letter indicating a prize. The others letters are unmarked. What is the probability of selecting the two matching prize envelopes?

  58. which whole numbers are greater than 30 and less than 35?

  59. When selecting courses for university, Mimi must take 2 math courses, 4 arts courses, 3 sciences courses, and 1 elective. There are 7 math courses to choose from, 10 arts courses, 6 sciences courses, and 5 electives. How many different course selections

  60. Express your answer in the form found using Euler's Formula, The cube roots of 2 + 3i

  61. What is the median of the data set below? Round to the nearest while number.

    Test scores: 76, 92, 84, 97, 72, 88, 77

  62. I am confused about this problem. Any help is appreciated.

    A chemist performs a series of reactions that produce binary lithium compounds. The elements include sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine. The models below represent

  63. I am confused about this problem. Any help is appreciated.

    A chemist performs a series of reactions that produce binary lithium compounds. The elements include sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine. The models below represent

  64. I am confused about this problem. Any help is appreciated.

    A chemist performs a series of reactions that produce binary lithium compounds. The elements include sulfur, chlorine, nitrogen, fluorine, selenium, oxygen, and iodine. The models below represent

  65. Let the polar coordinates of the point (x, y) be (r, θ). Determine the polar coordinates for the point (2x, y)

  66. Which best describes how patent law encourages market competition?

    A It protects people’s ideas. B It protects companies’ copyrights. C It prevents companies from forming trusts. D It prevents companies from price-fixing.

  67. The sum of 4 and b is at least 23

  68. On three 150-point geography tests, you earned grades of 88%, 94%, and 90%. The final test is worth 250 points. What percent do you need on the final to earn 93% of the total points on all tests? plz help soon i am running out of time

  69. Which option is an important source of public opinion?

    surveys >personal background< foreign policy the Constitution Please help..

  70. A weather balloon is filled with helium that occupies a volume of 5.75 104 L at 0.995 atm and 32.0°C. After it is released, it rises to a location where the pressure is 0.720 atm and the temperature is -14.7°C. What is the volume of the balloon at that

  71. The area of the parallelogram is (4x+16) square feet. Write an expression for the base.

  72. Simplify the expression

    n+3(n−1)

  73. How far does a plane fly in 17 s while its velocity is changing from 144 m/s to 75 m/s at a uniform rate of acceleration?

  74. A car is traveling 26 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 7.0 m/s2. How far does the car go before it stops?

  75. A car is cruising at a steady speed of 35 mph. Suddenly, a cuddly puppy runs out into the road. The driver takes 1.7 seconds to react, and then slams on the brakes. The brakes slow the car down at constant acceleration for 4.0 seconds until the car stops.

  76. In male children, the testes

    a) contain spermatogonia that are capable of replicating. b) contain cells that actively undergo mitosis through the male's entire life span. c) are inactive until puberty. d) A and B e) A and C

  77. Penicillin is

    A. filtered B. excreted C. secreted D. A and B E. A, B, and C I think the answer is E. Can someone clarify that? Thank you.

  78. Michele is a photographer. She sells framed photographs for $100 each and greeting cards for $5 each. The materials for each framed photograph cost $30, and the materials for each greeting card cost $2. Michele can sell up to 8 framed photographs and 40

  79. If you roll a 6-sided die 36 times, what is the best prediction possible for the number of times you will roll a five?

  80. What expression gives the solutions of -5+2x^2=-6x?

  81. Prediction of colors for V(CN)6 ^-2, VCl6 ^-2, and V(edta)?

    I think the above are transition metal complexes and if it helps the link below contains some of the energy levels and colors imgur.com/gallery/S1w9XFi

  82. When 200 mL of an aqueous benzoic acid solution were extracted with 30 mL of ethyl actetate 45% of the benzoic acid were extracted. Calculate the partition coefficient of benzoic acid.

  83. Need help with Chemistry, thanks in advance!

    For the system: 2H2O(g) ↔ 2H2(g) + O2(g) ; at equilibrium 27.0g of H2O, 0.25g of H2 and 16.0g of O2 was found in a 5.0L flask. Calculate the equilibrium constant, Keq.

  84. When 400ml of a 0.01M MgCl2 solution is mixed with a 300ml if a NaOH solution at pH 9.0, a precipitate will form. True or False?

  85. If an arrow is shot upward on Mars with a speed of 52 m/s, its height in meters t seconds later is given by

    y = 52t − 1.86t2. (Round your answers to two decimal places.) What is the average speed over the given time intervals? (i) [1, 2] (ii) [1, 1.5]

  86. If an arrow is shot upward on Mars with a speed of 52 m/s, its height in meters t seconds later is given by

    y = 52t − 1.86t2. (Round your answers to two decimal places.) What is the average speed over the given time intervals? (i) [1, 2] (ii) [1, 1.5]

  87. If an arrow is shot upward on Mars with a speed of 52 m/s, its height in meters t seconds later is given by

    y = 52t − 1.86t2. (Round your answers to two decimal places.) (i) [1, 2] (ii) [1, 1.5] (iii) [1, 1.1] (iv) [1, 1.01] (v) [1, 1.001]

  88. Explain the reaction (iron sulpide) using the Big Idea of Energy?

  89. In an experiment, 95.0 mL of 0.225 M silver nitrate was mixed rapidly with 47.5 mL of 0.225 M calcium chloride in a coffee cup calorimeter. If a reaction occurred, was it exothermic or endothermic? If the reaction started at 23.7 °C, what is the final

  90. In the early months of some year, one site added 0.5 million new accounts every day. At this rate, how many days would be needed to add 40 million new accounts?

  91. A car has a fuel efficiency of 33 miled per gallon.(a) Find a function G that calculates the number of gallons required to travel x miles. (b)If the cost of gas is $4 per gallon, find the function C that calculates the cost of fuel to travel x miles.

  92. How would a conflict theorist analyze the attitude about the feminist perspective?

  93. Concentration vs Distance plots resemble _____________ .

    Lognormal distribution Binomial distribution Lorentzian distribution Gaussian distribution

  94. Change in Gibbs free energy is _____ related to interfacial energy and _____ related to radius of precipitate.

    directly, inversely inversely, directly directly, directly inversely, inversely

  95. Which of the following phase diagram shows liquid immiscibility ?

    Eutectic Peritectic Monotectic Eutectoid None of these

  96. MIKE has a dog pen with an area of 120 sq. Feet. What is its width?

  97. What is 7/2 into a proper fraction?

  98. The correlation coefficient between X and Y is the same as the correlation coefficient between Y and X.

    True - If you were to find the correlation coefficient with a given data set for x and y, it would have the same correlation coefficient value as y and

  99. What volume will 11.2 grams of H2 gas occupy at 25.1oC and a pressure of 758 mmHg?

  100. Alkaptonuria is a recessive trait. If tow parents are carriers(heterozygous, unaffected), what is the chance they would have:

    A. 2 children, both with alkaptonuria? B. 3 children, all 3 not having alkaptonuria? C. 5 children, the first 3 not having

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