Sheila

Most popular questions and responses by Sheila
1. chemistry

You are analyzing a solid isolated from a reaction and find that its boiling point is over 1000 ∘C. You dissolve the compound in water solution and recrystallize it to produce some solid crystals that you use to determine that the compound is a

asked on January 23, 2014
2. Math

Ten students achieve the following test scores on an exam: 78, 69, 45, 89, 74, 37, 99, 77, 100, 82. What is the interquartile range of these scores?

asked on April 17, 2017
3. chemistry

given 2CH3OH+3O2->2CO2+4H2O 1. Calculate number of grams of CH3OH required to react with 34.0L of O2 at STP. 2. How many liters of CO2 at 18 degrees Celcius and 6.94 atm are produced when 3.40 mol of CH3Oh is burned completely. 3. What volume of CO2 is

asked on November 13, 2012
4. Statistics

A recent survey found that 72% of all adults over 50 wear glasses for driving. In a random sample of 100 adults over 50, what is the mean and standard deviation of the numbe who wear glasses?

asked on March 29, 2012
5. esl

Why do we say "he is average height" and not he has average height". don't we use have for a noun and is for an adjective?

asked on October 2, 2015
6. prealgebra

One cellular phone carrier charges \$26.50 a month and \$0.15 a minute for local calls. Another carrier charges \$14.50 a month and \$0.25 per minute for local calls. For how many minutes is the cost of the plans the same?

asked on December 3, 2013
7. Chemistry

What hydroxide concentration is required to (a) Initiate precipitation of Ag2CrO4 from a solution that is 2.12 x 10^-3 M in Ag+? (b) lower the Al^3+ concentration in the foregoing solution to 1.00 x 10^-9

asked on January 29, 2019
8. english

Which of the following would most likely be an entry in a sentence outline? A. Education beyond high school versus education beyond college B. Education as a pathway C. Education as a tool D. Education can change a person's life.

asked on April 15, 2015
9. Geometry

ray OB is the bisector of angle AOC and ray OC is the bisector of angle BOD. m

asked on September 5, 2013
10. Chemistry

How much ethylene glycol (C2H6O2, the major component of antifreeze) must be added to 1 L of water to keep it from freezing at -20 oC? Kf = 1.86 oC/m.

asked on February 3, 2015
11. Algebra

Two cell phone companies have different rate plans. Run fast has monthly charges \$8 plus \$8 per gig of data. B A & D 's monthly charge is \$15 plus \$4 per gig of data. Your task is to determine under what circumstances each company has the better pricing.

asked on April 29, 2019
12. Statistics

1)A quiz consists of 8 multiple choice questions, each with 5 possible answers. If random guesses are made for all 8 questions, find the probability that a student will answer exactly 5 correctly. A. 0.999 B. 0.009 C. 0.990 D. There is not enough

asked on August 5, 2019

OPQRS is a regular square-pyramid whose base has sides of 7 cm. Given that the total surface area of the pyramid is 161 cm2, find its slant height.

asked on January 23, 2011
14. Accounting

How do you find the ratio of time devoted to the business?

asked on March 11, 2008
15. Statistics

1)A quiz consists of 8 multiple choice questions, each with 5 possible answers. a. If a student guesses on all 8 of the questions, do the number of questions answered correctly form a binomial distribution? A. Yes B. No b. If "yes", give the mean (µ) and

asked on August 5, 2019
16. Statistics

. A grocery story recorded amount of time that 20 randomly selected shoppers waited checkout lines. The mean was 322 seconds (5 minutes, 22 seconds) and the standard deviation was 48 seconds. Construct a 95% confidence interval for the mean wait time for

asked on August 5, 2019
17. math

Which of the following salaries will have a purchasing power of \$24,035 if the inflation rate is five percent?

asked on January 24, 2013
18. MATH

The weights of black bears are normally distributed with a mean of 264 kg and a standard deviation of 38 kg. Let X be the weight of a randomly selected black bear. Use this information for exercises 2 and 3. 2. If P(a < X < 264) = 0.1139, find the value of

asked on August 5, 2019
19. microeconomics

If for a firm MRP > MFC, then the firm: a. is maximizing profits and should continue producing its current output. b. is maximizing factor costs and therefore is maximizing profits. c. should produce more output by increasing the quantity of factors

asked on August 18, 2007
20. math

write -5.5 recurring as a fraction or mixed number in simplest form.

asked on November 3, 2013
21. Math Word Problem

To make fruit punch, Edie mixes two kinds of juices in the following ratio: 1 cup of blueberry to 3 cups of red raspberry. How many cups of red raspberry will Eddie need to make 48 cups of fruit punch? How do you solve this? I was trying to divide 48 by 3

asked on December 9, 2016
22. Physics

Light travels at a speed 3x10^8 m/s. What distance does it travel in a time of 0.1s?

asked on August 24, 2012
23. chemistry

A sample of solid sulfur is heated with an electrical coil. If 105 joules of energy is added to a 12.4 gram sample initially at 24.4°C, what is the final temperature of the sulfur?

asked on April 8, 2013
24. advanced pre algebra

-6 >/= to g + 4

asked on December 10, 2013
25. Math

6g + 8 - 3g - 2 simplify

asked on September 17, 2019
26. math

What multiplication fact could you use to find a number that can be divided equally by 8 and 9? My answer is 8 x 9 = 72. Is this correct?

asked on February 14, 2012
27. MAT126: Survey of Mathematical Methods

All numbers in our real number system are the product of prime numbers. Complete the following steps for this discussion: List the ages of two people in your life, one older than you and one younger than you. It would be best if the younger person was 15

asked on December 20, 2013
28. writing algebriac expression

The total amount of money (in cents) in y quarters, 7y dimes, and (2y - 1) nickles.

asked on September 26, 2012
29. Physics

Four charges are located at the corners of a square as shown below. Calculate the magnitude and direction of the net force on charge -3Q and charge 4Q. (sorry don't have picture, but it is of a square with corners -Q, 2Q, -3Q, and 4Q clockwise). I don't

asked on May 13, 2010
30. algebra

A department store purchases gift boxes that each have a volume of 256 cubic inches. The width of each box is 4 less than the length. The height is twice thw width. What are the dimentions of a gift box?

asked on February 23, 2008
31. physiology

a One of the major physiological factors that triggers thirst is: a) a rise in plasma osmolarity b) a dry mouth from high temperatures c) becoming overly agitated d) drinking caffeinated beverages a

asked on December 11, 2006
32. PHYSICAL SCIENCE

How do the pressure variation with depth affect our ability to explore the ocean?

asked on October 22, 2012
33. history

ive got 2 questions....what points does Thomas Paine make in the pamhlet, Common Sense?? and what impact did Pain's pamphlet have in the colonies?? This site will give you an analysis of the pamphlet: http://www.sparknotes.com/lit/commonsense/

asked on December 5, 2006
34. Math Estimating Sides of a Triangle

Use the diagram below to answer the question that follows. I couldn't copy the diagram into this. It basically shows a Triangle ACD with CD=100ft. Then another line intersects above angle A and reads BE= 30ft. AB=50ft. and BC=? That is the part it wants

asked on December 7, 2016
35. Math M131A

a rubber ball has the property that on any bounce it returns to 1/3 of the height from which it just fell. Suppose the ball is dropped from 108 ft How far has the ball traveled by the fourth bounce?

asked on September 24, 2015
36. college, math

Karen and Wayne need to buy a refrigerator because theirs just broke. Unfortunately, their savings account is depleted, and they will need to borrow money in order to buy a new one. Sears offers them an installment loan at 12% (add-on rate). If the

asked on November 17, 2014
37. stats.& Prob

Astudy shoed 53% of college applications were submitted online. Assume this result is based on sa simple random sample of 1000 applications with 530 submitted online. Use 0.01 sig.level to test claim that among all student applications the percentage

asked on August 15, 2011
38. Math

A square is folded in half to form a rectangle. If the resulting rectangle has a perimeter of 15 inches,what is the are of the original square?HELP...please?

asked on September 16, 2010
39. Chemistry

What chemical compound is formed in the reaction when 6M HCl and 1M NaOH is reaction?

asked on August 30, 2012
40. math

Julius sold 5x as many computers as Sam sold last year. In total they sold 78 computers. How many computers did Julius sell. **Solve each problem by WRIING and solving the equation.

asked on November 13, 2013
41. chemistry

True or False? An equilibrium constant K_c=1x10^7 for a reaction indicates that the reaction favors product formation.

asked on May 2, 2010
42. microeconomics

A firm that is perfectly competitve will continue to hire factor units as long as: a. MRP < MFC b. MRP > MFC c. VMP < MFC d. MC > MR

asked on August 18, 2007
43. Math Word Problem

Riding on a school bus are 20 students in ninth grade, 10 students in tenth grade, 9 students in eleventh grade, and 7 students in twelfth grade. Approximately what percent of students on the bus are in ninth grade? How do I go about solving this?

asked on December 9, 2016
44. maths

mrs chan baked some cupcakes. She gave 1/6 of the cupcakes to her neighbour and 7/10 of this remaining cupcakes to her sister. If she had 12 cupcakes left, how many cupcakes did she bake together?

asked on July 22, 2016
45. Chemistry

Determine the number of molecules of the compound iron phosphate with 129.68 g Fe3(PO4)2

asked on March 22, 2015
46. Greatest Common Factor

There sre 16 rocks that are green and 24 rocks that are blue. Sharon is dividing her green and blue rock collection into bags. Each bag will contain the same number of each color of rock. How many rocks of each colr will be in each bag?

asked on February 8, 2014
47. Physics

A gamma-ray photon produces an electron-positron pair, each with a kinetic energy of 275keV . What was the energy of the photon? E=in MeV What was the wavelength of the photon? wavelength in m Please help thank you!

asked on April 23, 2013
48. Pre-Calc-Please check my answer-I think its correc

Could someone please check these-I had tried one last night but it was really wrong so I'm been working-hopefully these are correct. What are the roots of the equation and answers have to be simplified 2x^2 + 5x-10 =0 2x^2 + 5x-10+10=0+10 2x^2 + 5x = 10

asked on September 7, 2011
49. Algebra

Annual profit in thousands of dollars is given by the function, P(x) = 12x-100, where x is the number of items sold in thousands x ¡Ý 10. Will this profit function have a maximum if so what is it?

asked on July 2, 2011
50. Chemistry

When calcium oxelate is treated with an acidic solution of potassium permanganate, the following reaction occurs: CaC2O4(s) + MnO4-(aq) = Ca+2(aq) + CO2(g) + Mn+2(aq) Balance the equation.

asked on October 16, 2010
51. microeconomics

A monopsonistic firm, as compares to a perfectly competitive firm, pays _____ wage and hires _____ labor.

asked on August 18, 2007
52. math

Arrange the digits 5,6,7,8 and 9 in the boxes to make the greatest product

asked on January 9, 2017

Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

asked on April 24, 2013

When the kidneys secrete hydrogen ions, does the pH of the urine drop or is carbonic acid formed in the blood? Secondly, when the kidneys secrete hydrogen ions, it would raise the pH of the blood, correct? I'm really confused onthis and would appreciate

asked on April 25, 2012
55. 7th grade - Social Studies

how do you think women and native americans felt about not being included under the 14th amendment? how do you think white women felt when former slaves were allowed to vote and they were not? what percent of slaves were not freed after the issue of the

asked on October 12, 2009
56. Math

Denise is saving for a new bicycle. The bike cost \$89 and she already has \$54. What percent of the total cost of the bicycle has Denisa already earned (rounded to the nearest whole percent)

asked on January 6, 2016
57. algebra

One cellular phone carrier charges \$26.50 a month and \$0.15 a minute for local calls. Another carrier charges \$14.50 a month and \$0.25 per minute for local calls. For how many minutes is the cost of the plans the same?

asked on December 3, 2013
58. sentence skills

which is the most effective coordinating conjunction to jointhe following independent clauses.... Miriam wants a digital picture frame,___________ she cannot afford one just yet. a) but b) for c) so d) and

asked on May 26, 2011

On a Corporation's balance sheet, a large tract of company-owned land is reported at its original cost of \$50,000. The owner of the company is upset, because he thinks the land's true value is ten times that amount. He fears the low-cost figure may hurt

asked on May 11, 2010
60. math

i need help in solving these 2 problems...please help..thank you... Your home is built on a square lot. To add more space to your yard, you purchase an additional 4 feet along the side of the property. The area of the lot is now 9600 square feet. What are

asked on January 29, 2008
61. Environmental Science

What steps do you think can be taken to reduce the harmful effects of human activities on biogeochemical cycles? Which businesses would these changes impact the most? Thank you for using the Jiskha Homework Help Forum. Here are some links on life and

asked on March 15, 2007
62. math

please help... A new car is sold with or without antilock brakes, with or without a Cd player, with or wothout electric seats, and with or without a sunroof. How many different choices are there?? A new car is sold with or without antilock brakes, 2

asked on October 18, 2006

When UV light of wavelength 295nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.50eV. What is the work function of the metal? W0 in eV

asked on April 24, 2013

Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

asked on April 24, 2013
65. Physics

When UV light of wavelength 295nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.50eV. What is the work function of the metal? W0 in eV Please someone help me out. Thank you.

asked on April 22, 2013
66. Physics

Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

asked on April 22, 2013
67. Physics

A sandbag is dropped from the helicopter 125 m above the ground. What is its velocity at a height 60.0 m and when it hits the ground?

asked on September 30, 2012
68. geometry

A tourist is standing in the center of a roof 1000 feet skyscraper wants to a photo of the top of the adjacent skyscraoer that is 1500 feet tall what is the angle of elevation from the tourist to the top of the skyscraper to nearest yenth

asked on February 22, 2017
69. CHEMISTRY

Total Pressure in a vessel containing Oxygen collected over water at 25 *C was 723 torr. The Vapor Pressure of water at that Temperature is 23.8 torr. What was the pressure of gas?

asked on October 5, 2014
70. math

if each guest eats 2/3 of a small pizza, how may guests would eat 12 small pizzas.

asked on November 3, 2013
71. science

what is the difference between weathering and erosion

asked on January 7, 2013
72. statistics

According to a recent studey, 1 in every 4 women has been a victim of domestic abuse at some point in her life. Suppose we have randomly and independently sampled twenty-five women and asked each whether she has been a victim of domestic avbuse at some

asked on March 29, 2012

Could you please check if I read and answered the questions correctly? My answers are below in the separate area after the questions. Thank you No vivo en una ciudad. Vivo en el campo. La vida en el campo es muy divertida. Me divierto mucho con los

asked on November 5, 2011
74. biology

increase in the amount of living material and formation of new structures in an organism: a characteristic of all living things

asked on August 25, 2011
75. chemistry

A girl is celebrating her seventh birthday. Each guest is served one large slice of chocolate cake, a hamburger, French fries, and some oranges. Identify the food groups mentioned above. If one slice of chocolate cake contains 35g of carbohydrate, 15g of

asked on January 17, 2011
76. crt/205

I have trouble with labeling these statements if someone can help I would appreciate it. I need to know if the labeling is correct if not what is the correct labeling. I believe these are ambiguous or vague statements-1. federal reserve looking to spend

asked on October 31, 2010
77. physics

A person walks 25.0 degrees north of east for 3.80 km. How far would the person walk due north and due east to arrive at the same location? I did the Sin of 25 but the answer was wrong

asked on September 24, 2009
78. physics

A person walks 25.0 North of East for 3.80 km. How far would the person walk due North and due East to the same location?

asked on September 24, 2009
79. algebra

this is what u do on your first problem....first u take out the greatest common factor that would go into all of them... 4n^2-20n+24...now what number will go into all of them...well 4 will...4 will go into 4,20,and 24...so. it would be like

asked on November 13, 2006
80. pharmacy calculation

A suspension contains 2400 mg of active drug in 1000 ml waht is the percentage of drug in the final product? what is the answer? Total mass is 1000g + 2.400g. Percent by mass (m/m)= 2.4 /1002 * 100

asked on October 23, 2006
81. math

i think this one is right..but im not sure..Argyle has 8 T-shirts and 5 pairs of shorts that he wears with either sandals or sneakers. If all the colors and patterns coordinate, how many different outfits can he make?? i think its 80...but im not sure one

asked on October 18, 2006
82. Math

On a test I was given 2 triangles. One triangle gave measurements of all three sides as 2, 4, and 5. The next triangle had sides given 4 and 8 and it asked what the third side should be if the triangles were perpendicular. How would I solve this? Do I find

asked on January 13, 2017
83. Calculus

How do I solve for the investment of 20,000 with an interest rate of 7.5 compounded annually for 10 years? This is what I have so far and I don't know if I'm using the right formula. n=10 and I=r=0.075 A=P(1+i)n =20,000(1+0.075)10 This is where I'm stuck

asked on September 8, 2014
84. Physics

When UV light of wavelength 295nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.50eV. What is the work function of the metal? W0 in eV

asked on April 23, 2013
85. chemistry

80g of NaCl are dissolved in 400g H2O. if the vapor pressure of the water is 40 mmHg , what is the vapor pressure of NaCl above the solution?

asked on February 12, 2013
86. Algebra

Simplify. Please show all work. 6b^2 - 4b + 3b^4 - (7b^3 + b^4 - 4b)

asked on June 20, 2012
87. managerial economics

assuming that the firm's goal is to maximize present value of the profits in the subsequent 5 years, which of the following flows of profit would achieve that goal? Justify your answer. Note that the flows are represented by 5-tuples, i.e. five number each

asked on February 14, 2011
88. Physics-Please check my answer-I've been working o

If I went tubing with my little sister, and I have a larger mass, why would we both reach, in terms of energy, the bottom of the hill at the same time; Originally I thought because we would both be accerlerating at the same rate but that doesn't explain

asked on January 11, 2011
89. Algebra II-Please check my calculation

Find center, vertices, co-vertices and foci for the following; (x-3(^2/49 + (y-4)^2/4 = 1 Center would be (3,4) A=7 b=2 Vertices would be found this way: (h+-a,k) (3-7,4) (3+7,4) Vertices = (-4,4) (10,4) Co-vertices (h,k+-b) (3,4-2) (3,4+2)

asked on March 28, 2011
90. Data Management

Does interchanging the independent and dependent variables change the correlation coefficient for the set of data

asked on November 13, 2008
91. computer

this isnt really a school question but i have a question about the sun java...it wouldnt load any of my games using it but whenever i deleted it and using the regular java...its working fine...it doesnt make any sense...please i hope someone can explain

asked on March 19, 2007
92. biochem

why do lipids less dense than proteins? PLEASE HELP ME ANSWER THIS QUESTION. it really makes me wonder because lipids are much larger molecule compare to protein molecule but why protein is denser?

asked on February 22, 2016
93. math

Find the complex zeros of the polynomial function, and write f in factored form: f(x)= x^3 - 8x^2 + 30x - 36

asked on August 21, 2013
94. Physics

Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

asked on April 23, 2013
95. Math

The cheetah can 60 miles per hour. How many miles the can run for every half. Hour up to 2 hours?

asked on January 24, 2013
96. Physical Science

If liquid pressure were the same at all depths, would there be a buoyant force on an object submerged in the liquid?

asked on October 23, 2012
97. algebra

hi i need help on these problems..i have tried online to do it myself but i still don't understand what they are asking... compare the numbers in each exercise using an inequality symbol.. 4/5, square root of 1.3 pie, 19/6

asked on September 17, 2012
98. Algebra II

How long would it take to earn \$7000 on a 3500 dollar investment at rate of 7.8% compounded continuously? Would it be something like this: 7000=3000*(1+0.078)/? not sure about what to divided by??? Help-I'm really confused!!!!

asked on November 21, 2011
99. Pre-Calc-Please check my answer-I think I have it

Could someone please check these-I had tried one last night but it was really wrong so I'm been working-hopefully these are correct. What are the roots of the equation and answers have to be simplified 2x^2 + 5x-10 =0 2x^2 + 5x-10+10=0+10 2x^2 + 5x = 10

asked on September 7, 2011