# Questions Asked onApril 26, 2020

1. ## Math

Suppose we have a bag with \$10\$ slips of paper in it. Eight slips have a \$3\$ on them and the other two have a \$9\$ on them. How many \$9\$'s do I have to add before the expected value is at least \$8\$?

2. ## Statistics

A random variable is normally distributed with a mean of 50 and a standard deviation of 5. b. What is the probability that the random variable will assume a value between 45 and 55 (to 4 decimals)? c. What is the probability that the random variable will

3. ## Chemistry

If 3.21mol of a gas occupies 56.2L at 44C and 793torr ,5.29 mol of this gas occupies _______ L under these conditions.

4. ## English

Read This Poem. Continuous as the stars that shine And twinkle on the milky way, They stretched in never-ending line Along the margin of a bay: Ten thousand saw I at a glance, Tossing their heads in sprightly dance. The waves beside them danced; but they

5. ## Statistics

Sampling Distribution of 𝒑̅ 4. The population proportion is .45. What is the probability that a sample proportion will be within + .04 of the population proportion for each of the following sample sizes? 1. n=150 2. n=220 3. n=510 4. n=1200

6. ## pre-calculus

Vector a is expressed in magnitude and direction form as a⃗ =⟨√26,140∘⟩ . What is the component form a⃗ ?

7. ## chemistry

In your own words, describe what a catalyst does in a chemical reaction.

8. ## chemistry

The pH of a 0.25 M aqueous solution of hydrofluoric acid, HF, at 25.0 °C is 2.03. What is the value of Ka for HF?

9. ## economics

Suppose the market demand for good A given by Qd= 300 -20 P and the market supply for Good A is given by Qs=20P-100,where P=price of Good A. Q;Graph the supply and demand schedules for Good A using P5 through P15 as the value of P. Q; In equilibrium, how

10. ## physics

A golf ball and a bowling ball are dropped from the same height, which bounce and return to the same starting height. Which one experienced a greater impulse after they have interacted with the ground?

11. ## math

a) The population size of a country is increasing at a rate of 4% per year. How long does it take until the country has doubled its population size? b) The number of new flu cases is decreasing at a rate of 5% per week. After how much time will the number

12. ## Algebra

Jon begins jogging at a steady rate of 3 meters per second from the left side of lane 1. Laura also starts at the left side, but jogs at a rate of 4 meters per second in lane 2. Ellis starts at the right side of lane 4, 100 meters down the track, and runs

13. ## chemistry

How much heat is produced when 2 moles of water are produced from burning hydrogen gas? Show your work. ΔHf0 (kJ/mol) H2 (g) 0 O2 (g) 0 H2O (g) -241.8 2H2 (g) + O2 (g)  2H2O (g)

14. ## chemistry

Consider the following reaction. CaO (s) + H2O (l)  Ca(OH)2 (s) + 65.2 kJ If you start with a container holding a mixture of the CaO (s), H2O (l) and Ca(OH)2 (s) at equilibrium, describe what happens to the amount of CaO if each of the following changes

15. ## chemistry

For the endothermic physical change of water (liquid) into water vapor (gas), describe the entropy change, the enthalpy change, and use Gibb’s Free Energy to explain when this reaction will be spontaneous and when it will not.

16. ## Statistics

Suppose we are interested in bidding on a piece of land and we know one other bidder is interested. The seller announced that the highest bid in excess of \$10,100 will be accepted. Assume that the competitor's bid x is a random variable that is uniformly

17. ## physics

A ball is spun in a circle with constant speed, parallel to the ground. Ifthe center of the circle is kept at the same height but the circle of motionchanged to be perpendicular to the ground and keeping the same speed, waswork done on the ball?

18. ## Algebra

Jon begins jogging at a steady rate of 3 meters per second from the left side of lane 1. Laura also starts at the left side, but jogs at a rate of 4 meters per second in lane 2. Ellis starts at the right side of lane 4, 100 meters down the track, and runs

19. ## History

Which of the following occurred as the United States industrialized? Choose the TWO correct answers. A. Factories were built in mild climates.**** B. People moved from the countryside to towns and cities for jobs.** C. Immigrants were blocked from factory

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20. ## History

Explain how politics and religion led to an American era of reform during the early and mid-1800s.

21. ## Social studies

What three things have threatened snow leopards in their natural habitats?

22. ## English

What is a feature of appeal to moderation? It assumes one thing causes another, even though there is no evidence linking the two. It relies on the idea of compromise but does not result in a logical outcome. It assumes that everyone should have the same

23. ## Chemistry

Describe the heat involved if you touch a flask containing an ongoing endothermic reaction

24. ## chemistry

You start with 20 g of ice (H2O) at 260 K in a thermally isolated container. If 15500 J is added by heat, what will be the final temperature and state of the H2O? Show your work. (Cice = 2.1 J/gK, Cwater = 4.18 J/gK, Cwatervapor = 1.7 J/gK, ΔHfus(H2O) =

25. ## chemistry

Describe what would happen if you had 30 g of water at 273 K in a thermally isolated container and added 10 g of ice (starting temp 260 K). Include a description of heat flow and of changes in the temperatures and states of both the ice and water.

26. ## Maths

How do I find the coefficient of y^99 in the expansion (y-1)(y-2)(y-3)...........(y-100) Please I need details solution

27. ## Maths

If Ω=ΣΣΣ(mn)/(m+n+p)!=5e/24 For the first summation M=1 to +∞ Second summation N=1 to +∞ Third summation p=1 to +∞ I was giving a hint but still ΣΣΣ(mn)/(m+n+p)!x^(m+n+p)=f(x) Where f(0)=0

28. ## math

In the local mall there are twice as many clothing stores as there are music stores. There are twice as many music stores as there are computer stores. If there are 16 clothing stores, how many computer stores are in the mall?

29. ## Physics

A calorimeter has a mass of 100g and a specific heat of 0.900 cal/g˚c and contains 400g of water at 40˚c. when 91g of ice at 0.0˚c is added and completely melted, the temperature of the water is 18.2˚c. calculate the heat fusion of the ice

30. ## Science

Calculate the force on an object of mass 500g which produces an acceleration of 409cm³

31. ## geometry

Classify a triangle with side lengths of 28 in, 34 in and 49 in.

32. ## Statistics

Sampling Distribution of 𝒙̅ 3. A Suppose a random sample of size 80 is selected from a population with s = 8. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate).

33. ## History

Why were there fewer industries in the South than in the North in the mid-1800s? Choose the two correct answers. A. The North had more natural resources for manufacturing. B. People in the South with money bought farmland and enslaved workers. C. The North

34. ## Maths

The diagram shows the position of three airports . A and G. G is 200 kilometres from A E is 160 kilometres from A From G the bearing of A is 052 degrees From A the bearing of E is 216 degrees How far apart are airports G and E?

35. ## Algebra

Can I have your help with an algebra/complex numbers related question? Question : What is the least possible integer for n, such that [(1+i)(1-i)]^n = 1. Note that i is the squre root of -1. First I multiplied both numerator & denominated by (1+i) to get,

36. ## chemistry

why stoichometry is important in chemistry

37. ## Maths

PLEASE HELP ME!! The diagram shows the position of three airports . A,E and G. G is 200 kilometers from A, E is 160 kilometers from A, From G the bearing of A is 052 degrees, From A the bearing of E is 216 degrees. How far apart are airports G and E?

38. ## Math

A family went out to dinner, and their food and beverage total \$51.39. 6% sales tax is added to their bill,and then they plan to leave a 15% tip.what will the total cost of their bill be?

39. ## Calculus

Suppose an investment is expected to generate income at the rate of R(t) = 200,000 dollars/year for the next 6 years. Find the present value of this investment if the prevailing interest rate is 8%/year compounded continuously. (Round your answer to two

40. ## Careers

What job will l do after doing these subjects agriculture, mathematics and geography

41. ## Spanish

1.Yo ________ mucho trabajo 2.Ella _________ unos zapatos nuevos 3.Ellos________ un perro peligroso 4.

42. ## Math

Estimate 461 -- 7

43. ## algebra

Consider the infinite geometric series below. a. Write the first 4 terms of the series b. Does the series diverge or converge? c. If the series has a sum, find the sum. ∞ ∑ (-2)^n-1 n=2 not sure how to do this at all

44. ## chemistry

Would benzene (C₆H₆), a nonpolar solvent, dissolve CH₄?

45. ## World History

What is a consulate? I'm learning about the French Revolution right now if that helps. I've been getting multiple different answers and I'm confused.

46. ## physics

Two balls of mass m collide, coming from opposite directions. One going twice as fast as the other. Which mass experiences the largest force during the collision?

47. ## physics

A block experiences three forces acting on it: Force 1 of 10N south, Force 2of 10N East, Force 3 of 5N North. The block moves 2 meters west. Which did most work?

48. ## physics

Two blocks of equal mass are raised 10meters. One of them is placed on top of a long ramp, where it is released to slide down to the bottom. The other block is dropped from its raised height. Which one has the largest speed when it hits the ground? What if

49. ## spanish

1.Describe a "traje de poblana". Write your answer in English. 2.Explain who or what "Año Viejo" is and its significance. Write your answer in English. 3. Discuss three important achievements of the ancient Maya. Write your answer in English. 4.What was

50. ## Geography

How many kilometres on the ground is 4 cm distance on the map of South Africa

51. ## History

What are the two cultural backgrounds of a majority of Mexicans? A. Mexican Indian and African B. Native American and British C. Spanish and British D. Spanish and Mexican India I Think it is A or C PLS HELP

52. ## math

which expression is equivalent to 479

53. ## math

The world population in the year 2018 was approximately 7.6 billions and it grows at the rate 1.1% per year. Assuming that the rate does not change over the next years: a) Write a formula for the world population size depending on time b) What would be the

54. ## english

What do you think motivates the actions of the main characters? Can you give a example

55. ## Algebra

Write an equation for "the difference 86 and 42

56. ## Calculus

write the repeating decimal 0.64 as the ratio of two integers

57. ## Math

Is 2,3,5,8,12

58. ## Chemistry

You just bought a ring made of pure gold for \$450.0. If the ring has a mass of 6.43g, what is the price per atom?

59. ## English

book everything everything i dont know whats maddys motivation What do you think motivates the actions of the main characters

60. ## English

everything evrything Are the characters or their actions realistic? Are they relatable to others in society?

61. ## History

“Uncle Sam’s Youngest Son: Citizen Know-Nothing.” Which topics might the lyrics discuss? Choose the TWO correct answers. A. expanding to western areas B. opposition to Roman Catholics C. hostility to immigrants D. problems with urbanization E.

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what are the poet's literal meaning of lines 7-8?

63. ## algebra 2

find the exact value of each expression if 0 degrees< theta < 90 degrees. if tan theta= 4, find sec theta

64. ## Science

An 8N force stretches a spring to the 20cm mark on a metre rule.if the extension on the spring is 4cm,calculate the original length of the spring?

65. ## History

What were the initial challenges of constructing an effective railroad system?

66. ## algebra

At 3:00 PM a man 148 cm tall casts a shadow 143 cm long. At the same time, a tall building nearby casts a shadow 170 m long. How tall is the building?

67. ## physics

an 85kg man falls 10m. how much kinetic energy does he gain