# Matthew

Popular questions and responses by Matthew
1. ## math

Burj Khalifa is the world tallest building in Dubai at 828 m tall. The CN Tower in Toronto is 553 m tall. Sam wants to compare the Burj Khalifa and the CN Tower by creating rectangular prism models on a 10 cm by 10 cm square base. She has decided to

2. ## world history

What impact did the Silk Road have on Marco Polo’s expeditions to the Mongolian Empire? Marco Polo traveled the Silk Road to reach Mongolia but the path was too treacherous and led to Polo’s death. Macro Polo used the Silk Road to reach the Mongolian

3. ## calculus

find an equation of the curve that satisfies dy/dx=4x^3y and whose y-intercept is 7

Please check my work thanks!! A number cube with the numbers 1 through 6 is rolled. Find the given probability. 1. P(number < 2) (1 point) A. 1/6

5. ## English

What is the sentence pattern for: The waterfall rushed down the steep hillside. options: s-v-io-do s-lv-pa e-v-s s-lv-pn s-v-do s-v-do-oc quest pattern s-v

6. ## English

A few more things.Thank you. “Why don’t we go to the seaside for the weekend?” he asked (us). He proposed going to the seaside. He proposed that we should go...(??) Can you tell me if the names below are female or male names? Thank you. Helen (F)

7. ## Mathematics

In a class of 50 students, the number of students who offer Accounting is twice as the number who offer Economics. 10 students offer neither of tsubjecs the two subjects. I. Illustrate the information on a Venn diagram. II. How many students offer

8. ## math

A car skids to a stop, leaving four skid marks with an average length (D) of 60 feet. The road is asphalt. Skid tests reveal a drag factor(f) of 0.75. Since all four wheels were braking, the braking efficiency (n) is 100% or 1.00. To the nearest mile per

9. ## Physics

Please help me out, I can't figure out the process for answering this question and my TA is of no help, A 0.11- ball is placed in a shallow wedge with an opening angle of 130 degrees,for each contact point between the wedge and the ball, determine the

19. ## Chemistry

Doing some homework, are my answers right? HCN= Polar HCOOH= Polar H2CCCH2= Nonpolar Out of the following elements: Na, H, and Au order them least to greatest in the following: Eletronegativity= Na is smallest, H is second, Au is largest Ionization Energy=

20. ## Physics

Bernie drove home from a vacation in 1.5 hours. He traveled a total distance of 60 miles. What was his average speed in miles per hour?

21. ## Physics

When jumping, a flea reaches a takeoff speed of 1.5over a distance of 0.45. A.) What is the flea's acceleration during the jump phase. B.) How long does the acceleration phase last?

22. ## English

Can you check if everything is OK in my rephrase of Owen's poem? 1) In the first stanza the soldiers are retreating towards their trenches. Instead of being youthful, strong fighters, they are presented as prematurely old and weak. 2) They are bent over

23. ## differentiability

If g is a differentiable function such that g(x) is less than 0 for all real numbers x and if f prime of x equals (x2-4)*g(x), which of the following is true? A. f has a relative maximum at x=-2 and a relative minimum at x=2, B. f has a relative minimum at

24. ## Geometry

Does a regular nonagon have point symmetry? I know it has rotational symmetry but I am not sure if it would work for point symmetry I think I would.

25. ## math

to which subset of real numbers does the number -22 belong?

26. ## Equation

Four times a number, increased by 25 is 13 less than 6 times the number. What is the number? 4n+25=-13-6n. ???

27. ## Math

Tim wants to model a doll house from a real house that measures 60 feet in length by 28 feet in width. He decides to use a scale in which ¼ inch equals 1 foot. Based on this scale, What will be the length of the longer side of Tim's model? inches What

28. ## Math

A vehicle covers 2,160 miles in 5.5 hours. What is the average speed of the vehicle to the nearest tenth. I got 55.5, but I don't think it is correct.

29. ## algebra

The height above the ground of a ball thrown up with a velocity of 96 feet per second from a height of 6 feet is 6+96t-16^2 feet, where t is the time in seconds. According to this model, how high is the ball after 7 seconds? Explain (Thank you in advance!

30. ## English

(Nickel and Dimed) Ehrenreich’s experiences with low-wage workers revealed to her that in general, these workers treat each other A. as competition for higher-level jobs within the company B. as professionals who can help each other gain success C. with

31. ## Math

A submarine at -28 feet dives 40 feet. What is the submarine's elevation after the dive?

32. ## Math

Suppose that a wind is blowing in the direction S45°E at a speed of 50 km/h. A pilot is steering a plane in the direction N60°E at an airspeed (speed in still air) of 150 km/h. The true course, or track, of the plane is the direction of the resultant of

33. ## Pre-calc

There exist constants a, b, c, and d such that(sin x)^7 = asin 7x + bsin 5x + csin 3x + dsin x for all angles x. Find d. I tried rewriting them in the exponential form, but it becomes ugly as there are many negative cosines and divisions of i. Help?

34. ## Chemistry Need Help

Given the chemical equation, Cl2 + F2 2ClF, how many moles of ClF are produced in the reaction, if 1.50 moles Cl2 are made to react with 1.75 moles F2 ? I got the answer 3.50 moles but it was wrong. Can anyone help me please.

35. ## Operations with Fractions

Darion needs 20 pieces of string 3/8 inch in length. He cut a 4 7/8 inch piece of string into pieces that are 3/8 of an inch long each. How many more pieces of string of string does he need?

36. ## Algebra

A petroleum company has two different sources of crude oil. The first source provides crude oil that is 35% hydrocarbons, and the second one provides crude oil that is 60% hydrocarbons. In order to obtain 120 gallons of crude oil that is 55% hydrocarbons,

37. ## English

Writeacher, I downloaded a few details about modals expressing possiblity/probabity but I'm still doubtful about their use. My questions to you are numbers 1-2. Using modals to talk about the present: 1)Will / won't We use will and won’t when we are very

38. ## English

Writeacher, I'm finding it difficult to check these sentences, which need to be revised grammatically. 1) The Tempest is the last one of Shakespeare’s plays. It’s very different from his previous ones. In fact it is not a tragedy, like Macbeth or

39. ## English

Writeacher, I need your help to check a few things. Thank you. 1) At the first time Clare didn't say if she was free, but the next day she confirmed she was able to go to the cinema. (Can you check this sentence for me?) 2) I would like to enrol at the

40. ## English

I forgot to add the following data. Thank you very much. 1) You should make a short list of the job requirements before going for the interview. 2) There is nothing wrong with pulling out the paper with the company’s data on during the interview. 3) You

67. ## math

I asked the following the other day and received the following answer: Posted by Matthew on Sunday, March 17, 2013 at 11:03pm. A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the

68. ## math

A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the amount of oxygen-19 was 0.964 g. What is the half-life, in seconds, of oxygen-19?

69. ## Science

a 5-kilowatt source powers a motor that is lifting a 30 kg mass straight up. how far will the mass move in 6 seconds

70. ## Chemistry

What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s? Please help me!!

71. ## Chemistry

A photocell is a device used to measure the intensity of light. In a certain experiment, when light of wavelength 530 nm is directed on to the photocell, electrons are emitted at the rate of 5.1 10-13 Coulombs/sec. Assume that each photon that impinges on

72. ## Physics

A juggler throws a ball straight up into the air with a speed of 20. With what speed would she need to throw a second ball half a second later, starting from the same position as the first, in order to hit the first ball at the top of its trajectory?

73. ## Math

Compare. write >,

74. ## English

I retyped the first part considering your corrections. Can you check if it is OK now? Thank you very, very much. 1) Mr. Otis buys Canterville Chase from Lord Canterville. After that, Mr Otis drives with his family to Canterville Chase. When they arrive

75. ## English

I urgently need you to check this paragraph. Thank you, Writeacher. 1)Henry II was successful in bringing order and stability. 2) To avoid civil wars, he needed to reduce the power of the barons and wanted professional soldiers (mercenaries) to do this.

76. ## English

I left out two exercises for you to check. Thank you very much, Writeacher. By the way, do you say "talk about a topic of your choosing/or of your choice? 1) I ……………………… buy any butter, mum has just bought some. (Shall I include a colon

77. ## English

Here is the second exercise. Thank you very much for the revision. 1) John ……………………… buy the dictionary for the exam: he can take mine. 2) You ………………………stand on the left on the escalators. 3) I

78. ## English

Can you check if the various exercises are all possible? Thank you, Writeacher. Here is exercise 1. •1) The new German teacher (arrive) _______on Tuesday, for his first lesson. 2) On Saturday night we (meet) _______our friends in the square at 3

79. ## English

Can you please check the sentences? Thank you, Writeacher. 1) Are there any questions before you start? Did you have any difficulty in doing your homework? 2) Take a photocopy and pass the others on. Share these copies, one between two. Please, keep an eye

80. ## English

Can you please check these instructions, Writeacher. Thank you very much. English remedial test 1) Complete the following sentences with must/mustn’t, have to, don’t have to, should/shouldn’t 2) Fill in the correct future form (will future, going to

81. ## English

Can you please check these sentences on history, please? Thank you, Writeacher. 1) In the 8th and the 9th centuries Scandinavian invaders, known as the Vikings, attacked the monasteries and villages near the water and robbed them. 2) King Alfred the Great

82. ## English

I left out the following sentences. Can you please check them? I hope they are the last on the same subject. I really rely on your invaluable help. 1) Caliban feels like a slave. He has o obey Prospero's orders because of Prospero's magic powers. There is

83. ## English

I left out the following sentences. Thank you very much. 1) The Tempest is the last one of Shakespeare’s plays and it’s very different from his previous ones. In fact it is not a tragedy, like Macbeth or Hamlet, but a romance based on forgiveness and

84. ## English

I urgently need you to check these sentences. Thank you very much. 1) “Pamela” is an epistolary novel, that is a collection of letters written by a virtuous girl, Pamela Andrews, to her parents. The plot is very simple and built around the

85. ## English

Just a question. If you had to write this sentence in the second conditional: If the weather is bad, I won't go out. If the weather was/were bad, I wouldn't go out

86. ## English

Writeacher, I urgently need you to revise the introductory part of Chapter 10 (Dr Jekyll and Mrs Hyde). Can you check tenses,please? 1) In Chapter ten Dr Jekyll comes to the realization of the primitive duality of man. He admits that man is not truly one

87. ## statistics

Times for a surgical procedure are normally distributed. Method A has a mean of 28 minutes and a standard deviation of 2 minutes for completion. What is the probability that a surgical procedure conducted by method A takes at most 33 minutes to complete?

88. ## Chemistry

I need some help with some of these questions: The action of bacteria on meat and fish produces a poisonous compound called cadaverine. As its name implies, it stinks! It is 58.77 percent carbon, 13.81 percent hydrogen, and 27.40 percent nitrogen. Its

89. ## Math

Determine the values of x for which the function f(x) = 3/(√x^2+3x-4) is continuous.

90. ## Chemistry

An aqueous solution of copper (I) chloride is 15.7% by mass copper (I) chloride. Copper (I) is 35.8% by mass chlorine. If the solution has a density of 1.045 g/cm³, how many gallons of solution contain 2.3 kg of copper?

91. ## Chemistry

I need to know how to right a net ionic equation for the following chemical reaction: 5 H2C2O4 + 3 H2SO4 + 2 KMnO4 = K2SO4 + 2 MnSO4 + 8 H2O + 10 CO2

92. ## Geometry

The sum of the measures of the angles of a polygon with n sides is given. Find n. 32) 180 33) 1080 34) 1980 35) 2880

93. ## History

would an Egyptian style revolution beneficial or detrimental to the US government?

What are the d themes of geography ,

95. ## science

an unknown metal has a volume of 20cm^3 and a mass of 54g. Identify the metal

96. ## math

I wrote my question wrong. It should be write 25000000 in expanded notation using the power of 10

97. ## Physics

A spring has a spring constant of 259N/m. Find the magnitude of the force needed (a) to stretch the spring by 3.54 10-2m from its unstrained length and N (b) to compress the spring by the same amount. N

98. ## Chemistry

A silver bar has mass of 368g. What is the volume, in cm^3, of the bar? the density of silver is 19.5 g/cm^3.?