Kai

Most popular questions and responses by Kai
1. physics

an antifreeze solution is made by mixing ethylene glycol (density= 1116 kg/m^3) with water. suppose that the specific gravity of such a solution is 1.0730. assuming that the total volume of the solution is the sum of its parts, determine the volume

2. Chemistry

A hydrate of copper (II) sulfate with formula CuSO4.xH2O has a molar mass of 250.0 g/mol. 2.545 g of hydrate is heated and 63.85% of the residue is found after heating. a) Determine the value of x in the formula of the compound b) What is the molecular

3. Algebra 1

Question: The height in feet above the ground of an arrow t seconds after it is shot can be modeled by y = -16t(squared) + 63t + 4. Can the arrow pass over a tree that is 68 feet tall? Explain. Completely lost, could anyone help me out?

4. chemistry

When a 8.45-mg sample of a compound containing carbon is burned completely, 18.1 mg of carbon dioxide is produced. What is the mass percentage of carbon in the compound?

5. Math (Basic)

"A woman earns 10.00 per hour at her job, but if she works more than 20 hours in a week she is paid 1.5 times her regular salary for the overtime hours worked. One week her gross pay was 275. How many overtime hours did she work that week? Express your

6. Chemistry

Liquid octane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water. Suppose 5.71 g of octane is mixed with 5.0 g of oxygen. Calculate the maximum mass of carbon dioxide that could be produced by the chemical reaction. Be sure

7. Math 11

Express the following in completed square form: y = (2x)^2 + 14x - 11 Please show the work because I do not understand it.

8. Science

What fraction of the thickness of the thickest continental crust is the thickness of the oceanic crust? Give your answer as a reduced fraction.

9. math

julia wants to make 8 bows using 18 feet of ribbon.she wants to use an equal length of ribbon for each bow with no ribbon left over.how many feet of ribbon can she use for each bow?

10. Precalc

An investment of \$37,000 was made by a business club. The investment was split into three parts and lasted for one year. The first part of the investment earned 8% interest, the second 6%, and the the third 9%. Total interest from the investments was

11. AP Chem

The heat of combustion of octane (C8H18) is 47.8 kJ/g and one gallon of C8H18 has a mass of 2620 g. If a car using octane is driven 10,000 miles in one year and gets 25 miles per gallon of octane, what is the total energy consumption? 1. 5.01 × 107 kJ 2.

12. Chemistry

Compound has a molar mass of 283.89 g.mol^-1 and the following composition: Phosphorus: 43.64% Oxygen: 56.36% Write the molecular formula of X.

13. Physics

During launches, rockets often discard unneeded parts. A certain rocket starts from rest on the launch pad and accelerates upward at a steady 3.50 m/s^2. When it is 255 m above the launch pad, it discards a used fuel canister by simply disconnecting it.

14. Chemistry

Oxygen gas may be prepared by decomposing hydrogen peroxide, h2o2, using manganese (IV) oxide catalyst: 2H2O2(liquid) ----> 2H2O(liquid) + O2(gas) Calculate the amount of oxygen that will be produced from 1.35 moles of H2O2 Determine the mass of oxygen gas

15. AP Chem

What energy change is associated with the reaction to obtain one mole of H2 from one mole of water vapor? The balanced equation is 2 H2O(g) -> 2 H2(g) + O2(g)and the relevant bond energies are H-H : 436 kJ/mol; H-O : 467 kJ/mol; O-O : 146 kJ/mol; O=O : 498

16. AP Chem

What energy change is associated with the reaction to obtain one mole of H2 from one mole of water vapor? The balanced equation is 2 H2O(g) -> 2 H2(g) + O2(g)and the relevant bond energies are H-H : 436 kJ/mol; H-O : 467 kJ/mol; O-O : 146 kJ/mol; O=O : 498

17. english

In Katherine Mansfield’s short story “At the Bay,” which character is a foil to Stanley as he is introduced? A. the shepherd B. Jonathan C. Beryl D. Alice E. Linda

18. Chem

The heat of combustion of octane (C8H18) is 47.8 kJ/g and one gallon of C8H18 has a mass of 2620 g. If a car using octane is driven 10,000 miles in one year and gets 25 miles per gallon of octane, what is the total energy consumption? 1. 5.01 × 107 kJ 2.

19. English

Which line is most significant in developing the epiphany in this passage? A. “He was conscious of, but could not apprehend, their wayward and flickering existence;” B. “He watched her while she slept as though he and she had never lived together as

20. Math, slope

The cost of a taxi ride is \$5.00 plus \$0.75 for every 0.5 km. Graph this relation Identify the slope and the vertical intercept of the line. What do the represent? Write an equation relating the cost and the distance traveled. I'm not sure how I was

21. english

Which statement best describes the significance of the setting in James Joyce’s short story “Eveline”? A. The story offers a defense of Irish nationalism in the face of British persecution.* B. The story depicts World War I’s destabilization of

22. Accounting

The Divine Merchandising Corporation began March operations with merchandise inventory of 6 units, each of which cost \$27. During March, Divine Merchandising made the following purchases: (1) March 4, 12 units @ \$28 per unit, (2) March 15, 18 units @ \$30

23. Physics

A 5.0 Ω resistor, a 9.0 Ω resistor, and a 10.0 Ω resistor are connected in parallel across a 24.0 V battery. What is the equivalent resistance of the circuit? Answer in units of Ω

24. Global

How did peter the great increase his power

25. math

There are two containers of milk. There is twice as much milk in the first container as in the second. After using 2 gal. of milk from the second container and 3 gal. of milk from the first container, the second container had 4.5 times less milk than the

26. physics

The mass of a pendulum moves a total horizontal distance of 14cm in one cycle. What is the amplitude of the vibration?

27. algebra

a ball is thrown downward from the too of 110 ft bldg with an initial velocity of 14ft per second. the height of ball h after t seconds is given by the equation h = -16t^2-14t +110. how long after ball is thrown will it hit the ground

28. behavior problem (dogs)

please check my answer thanks Your friend owns a young Beagle. Her complaint is that the dog is a slave to his nose and he rarely pays attention to anything other than following a scent. She would like your help in obedience training and behavior

29. math

find the smallest angle of this pentagon x, x-15, x-50, x-30, x-40

here are 7 pencils and 9 pens in Jack's pencil case. Represent the number of pens to the number of pencils as a ratio.

31. math

Translate the following argument into symbolic form and determine wheter it's logically correct by constructing a truth table. If the team wins, then the team remains in the playoffs. If the team stays in the playoffs, then the championship is within

32. behavior problems (dogs)

Please check my answer thanks The problem with "quick fix" corrections designed to eliminate one specific behavior is that the A. dog may not respond to the correction. B. dog may be frightened by the correction. C. owner may be unable to utilize the

33. behavior problems (dogs)

please check my answer thanks An unwanted behavior persists because the A. behavior elicits a reward. B. dog has a temperament fault. C. trainer doesn't use treats as rewards. D. owner doesn't know how to punish the dog effectively. I picked A

34. English

Come, brothers all! Shall we not wend The blind-way of our prison-world By sympathy entwined? Shall we not make (5) The bleak way for each other’s sake Less rugged and unkind? O let each throbbing heart repeat The faint note of another’s beat To lift a

35. math

How many times as great as 15^9 is 15^10 ?

37. math

Correction of problem submiited earlier. The amount P of pollution varies directly with the population N of people. City A has a population of 494,000 and produces 260,000 tons of pollutants. Find how many tons of pollution we should except City B to

38. Physics

I have these two equations that I'm supposed to set equal to each other and find the answer for h which is height for this problem. But I don't think I'm solving it correctly. 0 - (h/5) = -1.1(v0) - (1/2)(-9.8)(1.1)^2 (v0)^2 = 2(-9.8)(h/5 - h) My final

39. Math

what does this derivative mean? (d/dx)(d/dt)(x^2t + t^2x - 2x^3)

40. Science

The ____ of the cell is the control center of the cell.

41. Chem

What happens when a student cup between trials? What effect will the error have on the calculated value of the delta H of neutralization?

42. behavior problems ( dogs)

Please check my answer thanks Your new client has a nine-month-old, neutered male Anatolian Shepherd Dog. She would like your help with a behavior problem. Each night, after she lets the dog out to eliminate, he refuses to come back in. She has ended up

43. behavior problems (dogs)

Please check my answer thanks When a well-trained dog is placed in a stay and ignores a distraction, the dog is showing A. intelligence. B. sociability. C. dominance. D. impulse control. I picked D

44. behavior problems (dogs)

please check my answer thanks You've evaluated Max, a two-year-old neutered male English Bull Terrier. You found him to be very friendly with humans; he's outgoing and confident. Max is an obedient dog and you anticipate he will do well in training. Max's

45. Behavior problems (dogs)

Please check my answer thanks A prospective client phones about her dog's behavior problem. When they go for a walk, the dog starts out walking nicely, until it finds an interesting scent. Then the dog stops and refuses to budge. She's a large dog, and the

46. Science

In the calibration of a calorimeter, an electrical resistsnce heater supplies 80J of heat and a temperature increase of 1.20°C is observed. What is the initial temperature of 8.50g of (C8H18) with a molar heat capacity of 39.36J/molK after heating in the

47. Physics

A plane is circling the airport. It takes 35 min to do one circle with a radius of 5.0 x 10^4 m. The plane weighs 6.05 x 10^4 kg. What the angular velocity

48. Math

"Two numbers have a sum of 15 and a difference of 7. What are the two numbers?" A word problem using system of equations and I'm pretty lost an help?

49. Pure Math

Find the complex number u=x+yi where x,y € I, such that u^2=-5+12i. HELPPPPPPP!

50. biology

Explain the vascular system of a lilac flower Some sites would help me very much as i cant find any that explain the vascular system of the lilac flower.

51. algebra

a ball is thrown downward from the too of 110 ft bldg with an initial velocity of 14ft per second. the height of ball h after t seconds is given by the equation h = -16t^2-14t +110. how long after ball is thrown will it hit the ground

52. Physics :/

An object 3-cm high is 20 cm from a concave mirror. The focal length of the mirror is 8 cm. a. Calculate where the image is located. b. Calculate the size of the image

53. Science

Sediment rocks are formed from _____ that are cemented and pressed together. I don't have a book to look in.

54. behavior problems (dogs)

please check my answer thanks Ariel is a six-year-old, spayed female Doberman. She has recently begun licking her left foreleg almost constantly. The licking has created a sore on her leg, but she continues the behavior. Your first recommendation to the

55. behavior problems(dogs)

please check my answer thanks You're contacted by the owners of Abbey, a three-year-old spayed Lab mix. Abbey has a history of biting her owners and visitors. The bites usually occur when the victim reaches for the dog. The owners believe that this problem

56. math

What is the measure of an angle if its two, adjacent, supplementary angles add up to 100°.

57. Math

Hello, can I please have help on how to find the area of a hexagon by knowing the apothem is 4 and the square root of 3? Thank you!

58. Financial Management

Calculate the present value of \$25,000 to be received in 5 years, assuming an opportunity cost of 10%.

59. chemistry

2NaClO2---> 2NaCl + 3O2 if 3.85 grams of NaClO3 react, how many moles of O2 are created?

60. Math

Match the expression: Subtract 41 from 24 raised to the 6th power; then multiply by 2.

61. Math

Subtract 5 from 8. Then multiply by c. Which of the. Following expressions matches the statement above? A.(8-5) x c B.(5-8) x c

62. math - would like to know if i did problem correct

4t^2/5=t/5+3/10 t=3/4, t=/1/2 thank you

63. Word Problem Question

I would like to know if I am correct, so far. The amount P of pollution varies directly with the population N of people. City A has population of 494,400 and produces 260,000 tons of pollutants. Find how many tons of pollution we should expect City B to

64. physics

It Takes 2 N of force to get a 15 kg object to move horizontally on a surface. What is the normal force of the surface on the object?

65. behavior problems(dogs)

please check my answer thanks Ideally, when working on a behavior problem, you'll show the owners ways to A. reorganize the environment so the dog has fewer chances to misbehave. B. discipline a dog correctly and not spoil him. C. teach some commands that

66. Physics help

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North)

67. math

Determine whether the following argument is correct. If it's not correct, explain what is wrong with ther argument and change the minor premise to make a correct argument. If a triangle is equilateral, then it has three equal sides. Triangle ABC doesn't

68. math

Two lookout stations, which are 25 miles apart along the coast on a north-south line, spot an approaching yacht. One lookout station measures the direction to the yacht at N 33degrees E, and the other station measures the direction of the yacht at S

69. Math

Match the expression: subtract 41 from 24 raised to the 6th power; then multiply by 2. Is it A. (24^6-41) x 2 Or B. 24^6-41 x 2 Or C. (24-41)^6 x 2

70. Math

Add d and 7 then divide by 3

71. Math

Divide18 by g. Then, subtract 7. C. 18/g-7 Is this right?

72. algebra - correction of previously submitted. Is t

4t^2/5=t/5+3/10 = t=3/4, t=-1/2

73. Algebra

*correction of previous post* Find the LCD of the rational expressions in the list. m-2/m^2+2m , -8/m^2+6m+8

74. Physics (Astro)

How do you express 1.65×10^4km as a multiple of 6.38x10^6 m?

75. mathematics

a cyclist bikes over a path at 10 miles per hour. he returns over the same path at * miles per hour. what was his average speed for the round trip.((please explain how to do this)

76. Physics

A closed organ pipe 0.8 m long has a diameter of 7.0 cm. The air in the church is 15oC. What is the fundamental frequency? If the heat is turned up to 20oC, what is the new fundamental frequency? - HELPHELPHELP

77. pre-algebra

what is x? -2x+4=3x-6

78. algebra

what is a good number sentence to show that 5 is a factor of 35?

79. Math

State different situations that do not involve money in which a formula like the one for compound interest is used. In each case, state a related problem and write its solution.

80. Math

Amy is charged 12% annual interest compounded monthly on the unpaid balance of a \$2000 loan. She did not make any payments for 2 years. Her friend said the amount she owed had more than doubled, is that true? how much does she owe?

81. social studies

What is an another word for replanting trees?

Please check my answer thank you very much for your help Based on the following information below please answer the question that follow. Area A: Brooklyn Brooklyn is a very heavily populated urban area within commuting distance from Manhattan by subway,

Please check my answer thank you very much for your time Use the information below to answer the question that follows it Area A: Brooklyn Brooklyn is a very heavily populated urban area within commuting distance from Manhattan by subway, bus, or car.

How did Gandhi demonstrate an appreciation for other faiths?

85. Religion

In the movie Gandhi, when he returned to India, what were 3 of the injustices he discovered?

86. behavior problems(dogs)

Please check my answer thanks The dog's desire to be in the same room with his owners is evidence of A. lack of confidence. B. pack drive. C. poor early socialization. D. separation anxiety I picked A ( wolves like to be part of a pack as well as dogs) tho

87. behavior problems (dogs)

Please check my answer thanks Often, when an owner disciplines his or her dog it's done A. to help the dog understand what is expected of him. B. to teach the dog a lesson. C. in anger. D. in the best interest of the dog. I picked C tho I have known people

88. Science

Identify the most important way heat is lost from the body during exercise? and these are the choices Evaporation Conduction Radiation Convection

89. Discrete Math

Could someone help me with this induction proof. I know its true. given then any integer m is greater than or equal to 2, is it possible to find a sequence of m-1 consecutive positive integers none of which is prime? explain any help is greatly appreciated

90. discrete math

Could someone help me with this induction proof. I know its true. given then any integer m is less than or equal to 2, is it possible to find a sequence of m-1 consecutive positive integers none of which is prime? explain any help is greatly appreciated

1. math

ok

posted on March 26, 2019
2. Math 11

The answer in the book says: y = 2 (x+7/2)^2 -71/2

posted on March 9, 2019
3. english

is it a?

posted on February 25, 2019
4. Science

Well, I usually call the people here sir bc I think most of the tutors here are male.

posted on September 15, 2018
5. Science

posted on September 15, 2018
6. Language Arts ?

B B A D

posted on June 1, 2018
7. social studies

god bless you Denise

posted on May 28, 2018
8. ~*Math Probability*~

Thanks, and, it's called "the honor code".

posted on April 25, 2018
9. Education technology

Pika- ah- ahcooo!

posted on April 23, 2018