# sarah

Newest questions and responses by sarah
1. ## science

What is the mass of sodium needed to make 2 g of sodium oxide (4Na + O2 → 2Na2O)? Ar values: O = 16, Na = 23. please help im really struggling. also please try to explain it to the simplest form because i really don't understand.

2. ## Maths

The sides of a triangle are in proportion 8:15:17.Find the length of each side if the perimeter is 1.52m

3. ## Physics

A 5.8 kg mass, M1 is on a horizontal frictionless table. A horizontal string is attached to M1 and it passes over a pulley at the edge of the table to a 5.6kg mass M2 that is hanging down freely. Initially the two masses are held stationary and then

4. ## Chemistry

A solution is prepared by combining 3.72 grams of an unknown non-electrolyte with 325.0 grams of chloroform. The freezing point of the mixture is -64.10 oC, while the freezing point of pure chloroform is -63.50oC. The kf of pure chloroform is 4.68

5. ## english

How and when does one use the subjunctive tense(s) in English? In addition, provide a sentence that properly uses the subjunctive tense.

6. ## math

what can restrict domain and range in a radical functions graphing them

7. ## Chemistry

Potassium tetraoxalate has the formula H2C2O4.KHC2O4.xH2O. 1.923 g of the above compound was neutralized by 22.7 mL of 1.000 M NaOH using phenolphthalein as the indicator. Calculate the value of x in the formula.

8. ## trigonometry

In a right angle triangle, the side adjacent to the 250 angle is 15 cm long. What is the length of the side opposite the 250 angle to the nearest centimeter

9. ## math

how do you make a percent a fraction

10. ## math

what is 12% as a fraction

11. ## English

I need help! What is your opinion of the idea that hope is an important quality? I need to write a critical and I am doing Jeannette from the memoir the Glass Castle I need to write initially, then, and finally. So for initially I want to talk about how

12. ## math

I really don't understand this so i would really appreciate if you helped me. Q. Find two consecutive integers whose reciprocals add up to 7/12. Thanks x

13. ## Spanish

if i want to say 'i helped my younger brother with his homework yesterday' in spanish would i say: - ayer, ayudé a mi hermano menor con sus deberes. or - ayer, ayudé a mi hermano menor con los deberes. thanks x

14. ## math

Betty makes pies. to make 6 pies, she uses 7 1\2 cups of flour. How many cups of flour are needed to make one pie.

15. ## math

John mixed 3\4 liters of yellow paint with 1 1\4 liters of red paint to make 2 liters of orange paint. He needed more orange paint. to make a new batch of orange paint, he used exactly 1 liter of red paint using the same ratio, how many liters of yellow

16. ## math

One out of 22 high school ball players plays college ball. One out of 27 college players plays professional ball. What fraction of high school players plays professional​ ball?

17. ## science

________digestion occurs in small intestine through the action of enzymes. PlZ help ASAP

18. ## Algebra

A ball is thrown vertically upward from the ground. Its distance in feet from the ground in t seconds is s=-16t^2+208t. After how many seconds will the ball be 640 feet from the ground?

19. ## history

Read the summary. The Ottoman Empire began as the unification of Seljuk tribes, organized by Osman Gazi (1). The Ottomans were a hybrid of the Turkish, Byzantine, and Muslim cultures (2). They embraced the Eastern Christian Orthodox religion and denounced

20. ## math

7. Make b the subject of the equation A = 1 × 𝑏𝑏 × ℎ . 2 (a) b = 1 × 𝐴𝐴 × ℎ (b) b = 1 × 𝐴𝐴 2 2 ℎ (c) b = 2 × 𝐴𝐴 × ℎ (d) b = 2 × 𝐴𝐴 ℎ

21. ## Physics

An escalator carries 60 people of average mass 70 kg to a height of 5m in one minute.Find the power needed to do this.

22. ## History

Which of the following is not a reason why the confederate Army was able to take control of Fort Sumter? A. The Confed. Army had fort Sumter surrounded B. The confed. troops broke through the fort’s defenses and invaded the fort. C. The confed. Army

23. ## Chemistry 30

predict the products of the reaction between acidified H2O2 with potassium permanganate solution H2O2 (l)  KMnO4 (aq) + 2H2O (l) + 6H+ (aq) + 6e- H2O2 (l) + 2H2O (l)  KMnO4 (aq) + + 6H+ (aq) + 6e- is this right? I'm confused. May I please get help?

24. ## computer science

I have to write a program in java that prompts and reads the size of a table (assume the table is math square table), and plotting number and star as the following pattern in the output. For example: when reading size = 4, the table in the output should

25. ## English

The race began modestly, in 1970, with only 110 people in the race. This revision combines sentences (4) and (5) in paragraph 3. Choose which sentence type BEST describes this revision.

26. ## algebra

A horizontal pedestrian bridge is supported from a parabolic arch. The bridge goes above a roadway that is 49 feet wide. At ground level, the Main Street span of the arch touches the ground, the arch is 16 ft. High. How tall is the arch at it’s tallest

27. ## chemistry

What mass of copper is produced when an excess of sodium is added to 5.0 g of copper sulfate?

28. ## chemistry

What volume of oxygen is produced when 200cm³ of hydrogen peroxide with concentration of 2.5moldm⁻³ fully decomposes? Give your answer to 3s.f. in dm³ and assume reaction takes place at STP.

29. ## math

The graph above compares age of a car to its value. which of the following is the age of the car when its value is \$12,500?

30. ## writing

So these 2 best friends are going to enter a contest to win concert tickets(of whom they both love ever since childhood), but it turns out only 1 can win, so one of the best friends entered the contest without the other knowing.

31. ## Science

A serial dilution is set up with an initial antigen concentration of 250 ug/mL. A serial dilution is carried out where 20 uL is moved from each tube into an adjacent which has been prefilled with 80 uL of buffer. What is the tube concentration of tube 8,

32. ## Physics

An object is located at the point (−3.00m,4.00m,0.00m). A position vector connects this object to the origin. Find the magnitude of the position vector and the angle it makes with the positive x-axis. I know the magnitude is 5.00m, how do I find the

33. ## Physics

A given force F→ is located in the yz-plane. It has a magnitude of 18N and is directed at a 30.0° angle clockwise from the positive y-axis. (a) Describe F→ using polar notation. (b) Describe F→ using its y- and z-components. (c) Describe F→ using

34. ## English

What does Penny mean when she refers to "patriarchal surveillance" on the Internet? In the story "Penny Cybersexism"

35. ## Statistics

An important measure of the performance of a locomotive is its "adhesion," which is the locomotive's pulling force as a multiple of its weight. The adhesion of one 4400-horsepower diesel locomotive model varies in actual use according to a Normal

36. ## chemistry

in nature, 51% of bromine atoms are bromine-79 and the other 49% are bromine-81. what is the mass number for each of these isotopes

37. ## Physics

A Chinook salmon can jump out of water with a speed of 6.60 m/s . How far horizontally d can a Chinook salmon travel through the air if it leaves the water with an initial angle of θ=27.0° with respect to the horizontal? (Let the horizontal direction the

38. ## Math

Use the well-ordering theorem to show that, if ∅ ⊂ A ⊆ Z and A is bounded superiorly (that is, there exists c ∈ Z such that for all a ∈ A a ≤ c), then A has a maximum element.

39. ## Georgia History

In a fully developed paragraph, explain how Georgia's location in the world affects its economy, culture, and development

40. ## History

Which accurately describe the causes of the contentious relationship between President Truman and General MacArthur? (Select all that apply.) a. Truman favored a containment policy on Communism, while MacArthur wanted to pursue the Communist forces into

41. ## History

Which battle was a major turning point for US and South Korean forces during the Korean War? a. Battle of Pork Chop Hill b. Spring Offensive c. Battle of Heartbreak Ridge d. Inchon Bay landing Is it D?

42. ## Maths

Parina spends 45% of her money on a dress and 15% on a bag.she had rs2400 left. how much she had at first?

43. ## Maths

Harry has 0.6 of his marbles to his younger bro and 0.5 of the remainder to his cousin. Harry has 36 marbles left. How many marbles did harry have at first ?

44. ## Math

A picture is 42 cm long and 32 cm wide. It has a 5 cm frame around it.all around the picture, 1 cm of the picture sticks into the frame so that the frame can hold it. What is the area of the frame? Plz help

45. ## Economics

In recent years, the governments of the industrially advanced countries have A. discouraged skilled developing countries' workers from emigrating to the industrially advanced countries. B. substantially reduced foreign aid to the developing countries. C.

46. ## math

Find the standard form of the equation of the parabola with the given characteristics. Vertex: (-9, 8); directrix: x = -16

47. ## math

Write the equation of the circle in standard form. 9x^2 + 9y^2 + 72x − 108y + 368 = 0 Identify its center and radius. center (x, y) = radius =

48. ## math

Find the standard form of the equation of the circle with the given characteristics. Endpoints of a diameter: (1, −7) and (7, −5)

49. ## calclus

Chemistry teachers love to have different shaped beakers in their classroom (I guess it makes the classroom look for impressive). Different shaped beakers result in different rates the water level rises. Task: Determine the rate in which the water level

50. ## chemistry

How many moles of Cu2+ ions are present in 1L of .125M CuSO4:5H2O solution?

51. ## Physics

17. Explain how water can transfer energy by conduction and by convection.

52. ## algebra

Find an power function of the form y=ab^x whose graph passes through the points (4,4) and (16,8).

53. ## algebra 2

Car depreciation- The value of a new car purchased for \$20,000 decreases by 10% per year. Write an exponential decay model for the value of the car. Use the model to estimate the value after one year.

54. ## History

What conflict resolution does Malala Yousafzai follow?  Competition, Collaboration, Compromise, Accommodation, Avoidance  _______________________________________________________________________  I am actually not sure. I used the conflict with Malala

55. ## History

What conflict resolution does Malala Yousafzai follow?  Competition, Collaboration, Compromise, Accommodation, Avoidance  _______________________________________________________________________  I am actually not sure. I used the conflict with Malala

56. ## History

What conflict resolution does Malala Yousafzai follow? Competition, Collaboration, Compromise, Accommodation, Avoidance _______________________________________________________________________ I am actually not sure. I used the conflict with Malala and

57. ## English- Poetry

How do authors use gothic and romantic elements to develop content and style that add beauty and power to their writing? (Examples to use: Poe—“Annabel Lee”, “Lenore”, “The Raven”, “The Pit and the Pendulum”--, “Mistletoe Bough”,

58. ## History

Mrs.Sue, I have completed three questions of the four. May you check them? I do not need help on the fourth one because my teacher still has to give us a booklet with the information and etc... I replied to the post that I posted: yesterday at 3:21pm

59. ## History

Who is Malala Yousafzai similiar to? I said Martin Luther King Jr, or Maya Angelou What are their goals? Malala:To provide 12 years of free, quality education to every child on the planet. She wanted to reach all those people who live in poverty, those

60. ## Calculus

Suppose the annual revenue for a company between 2000 and 2005 is approximated by R(t) = 18t^2 + 4t + 3, where t = 0 represents the year 2000. (a) Find the Average Value of R(t) between t = 1 and t = 6. (b) Find the Average Rate of Change of R(t) between t

61. ## Calculus -- Identity crisis

A function has f''(x) = 10 and has f'(4) = 0 and f(2) = 4. Find f(x).

Researching different reason why an employee may choose to alter his/her number of federal withholding allowances. Next, write a paragraph of at least five sentence, in which you identify and discuss the two most compelling reasons you identified for

63. ## Chemistry

Calculate the standard entalphy of formation of naphthalene(C10H8) from the following data: 1) standard enthalphy of combustion of naphtalene is -5153kJ/mol 2) standard enthalphy of formation of CO2 is -393.5kJ/mol 3) standard enthalphy of formation of H2O

64. ## Biology 20

List the substances that the colon absorbs: - vitamins like B and K - water - ions like chloride and sodium Is there anything that I am missing? I am sure these are right but are there more??

65. ## Science

minimum temperature required to dissolve 40g NaCl in 100g water thanks a ton

66. ## Science

100ml of 1.0 m KOH solution will neutralize 100 ml of 1.0 M H2SO4 solution Thank you!

67. ## Biology 20

Name 3 substances that the liver stores: 1) glycogen. When there is lots of sugar in the blood, the liver converts it into glycogen which is used for storage. Glycogen formed us determined by insulin which is released from pancreas. I'm not sure of what

68. ## english

The following passage contains ten run-ons and comma splices. Correct each error in the space provided by using (1) a period and capital letter, (2) a comma and a joining word, or (3) a dependent word. Be sure to use all three methods. The three sons of

69. ## Math

The farmer's boy has been sent to the market. He takes his dog for company. He also has a plump goose to sell, and a bag of corn. He knows he must be careful. He must make sure his dog doesn't have a chance to eat the dog, and he must make sure the goose

70. ## Chemistry

Determine the pH of a 0.45M solution of Na2SO3 where Ka1 = 1.5 x 10^(-2) and Ka2 = 6.3 x 10^(-8).

71. ## English

On the lines provided, write the word or words in each sentence that need to be followed by a comma. Be sure to include the commas. One comma rule applies in each sentence. Note To help you master the comma, explanations are given for five of the

72. ## math urgent

The state lottery (which has a 6% lottery tax) offers to pay winnings in 25 annual payments or one lump sum, sometimes called a cash-out option. This week’s lottery has a jackpot of \$30 million and a cash-out value of \$18.2 million. Granted that the odds

73. ## English

Each sentence below contains two examples of ineffective word choice. Underline each error. Then, in the space provided, write W, S, or C to indicate wordiness, slang, or cliché. Finally, use the answer line to rewrite each faulty expression, using more

74. ## math

The state lottery (which has a 6% lottery tax) offers to pay winnings in 25 annual payments or one lump sum, sometimes called a cash-out option. This week’s lottery has a jackpot of \$30 million and a cash-out value of \$18.2 million. Granted that the odds

75. ## Social

it is possible to be part of multiple nations simultaneously. however, in times of crisis, it is essential that loyalty to your country of residence take priority over any other loyalties.  To what extent should we embrace the perspectives reflected in

76. ## Math

In how many different arrangements can 5 dogs and 7 cats be placed in a row if the dogs must be next to one another?

77. ## Social

it is possible to be part of multiple nations simultaneously. however, in times of crisis, it is essential that loyalty to your country of residence take priority over any other loyalties. I haven't ever done position papers in grade 11. I'm having a hard

78. ## Math

In a given city there are 28 reporters of which 16 are men. If the committee of 4 reporters is to be formed A. How many different committees can be formed? B. How many different committees contain 3 men? C. How many different commitrees contain at least 2

79. ## biology

The DNA bases adenine and guanine have one nitrogen and carbon atom containing ring in their structure. These bases are known as __________.

80. ## English

The following passage contains eight fragments. Underline each fragment. Then rewrite it correctly on the lines below. Note To help you recognize and correct fragments, explanations are given for half of the items. The game of Monopoly was created by

81. ## biology

Why did Nicholas Copernicus wait to publish his works on his deathbed? His work on the three laws of motion contradicted the Lutheran Church. His work on heliocentric theory went against Catholic doctrine and beliefs. His work included the dissection of

82. ## biology

Which best describes Francis Bacon’s contribution to the Scientific Revolution?

83. ## chemistry

In the titration of Na2S2O3 against KIO3 the average titre value was 23.1cm3,the volume of iodine used in the titration was 25cm3 and the concentration of Na2S2O3 was 0.1M.calculate the molarity of KIO3

84. ## Biology 20

Identify one biochemical that is of particular significance to your animal. Explain why it is significant to your assigned animal and describe it. This chemical could be an enzyme, a toxin, something used in scent marking, or any other biochemical agent

State 2 molecules that get reduced and 2 that get oxidized during photosynthesis.  ---------------------------------- I know that NADPH and Glucose are in their reduced form.  2 molecules that get reduced. Will it be NADP+ because it is gaining 2

86. ## Advertising research: theory and practice

James wants to change the creative strategy in order to make consumer think differently about his product. He wants the product to be viewed as a product for sports enthusiasts. In order to do this, he must: a. conduct demographic research b. reposition

87. ## Advertising research: theory and practice

Amanda would like to develop a product for Coca-Cola for health conscious consumers. She first needs to conduct adequate _______ segmentation research in order to find out more about the market. a. positioning b. psychographic c. individualized d.

88. ## Advertising research: theory and practice

research primarily uses open-ended, probing questions to encourage consumers to discuss and share their thoughts and feelings on a particular subject. a. Quantitaative b. qualitative c. secondary d. primary

89. ## Social

we talk about the birth of nationalism being the french revolution. why might the americans dispute this

90. ## Math (Pre Calc)

If two forces of 5 lb. and 8 lb. are acting on the same point are equivalent to a single force of 10 lb., find the angle between the given forces, and the angle between the resultant and the larger force. I am not allowed to use law of cosines I must use

91. ## Math (pre calc)

You have recently been promoted and are now a senior pilot with BHS Exprress, providing courteous and timely service to countless cities across the Northeast. In order to arrive in New York City at the scheduled time, you know you must fly at a speed of

92. ## Pre Calc

You have recently been promoted and are now a senior pilot with BHS Exprress, providing courteous and timely service to countless cities across the Northeast. In order to arrive in New York City at the scheduled time, you know you must fly at a speed of

93. ## Pre Calc

If two forces of 5 lb. and 8 lb. are acting on the same point are equivalent to a single force of 10 lb., find the angle between the given forces, and the angle between the resultant and the larger force.

94. ## math

You are ordering photo prints online to send out to all your friends for the holidays. The first 20 prints cost 12¢ each, if you order more than 20 the price of the additional prints goes down to 8¢ each. a. Write a function to describe the cost of the

95. ## Chemistry

How do I plot the freundlich isotherm graph given P/atm and V/cm3 data. I know that the plot is suppose to be log x/M vs log c. However, how do I get the x/m from the data and which is the c. I have already plotted the Langmuir isotherm of this data. How

96. ## chemistry

Commercial aqueous hydrogen peroxide was diluted 150 times. 25cm3 of the sample solution was titrated with 0.02molar KMnO4 and 26.3cm3 was required to reach the end point. Calculate the molar concentration of hydrogen peroxide

97. ## Math

A rectangle whose length is 5.3 cm and whose width is 2.5 cm.

98. ## math

emma made a rectangular picture frame with a heigth of 25 5/6 inches. The frame is 5 2/3 inches wide. What is the hieght of the picture emma placed in the picture frame? explain how you found your answer?