Friday
October 31, 2014

Posts by ariana


Total # Posts: 137

Writing
In the other 6 groups there are 21 students in each of the 6 groups. *Does this sentence make sense.
October 26, 2014

Math
I don't understand you. Can you please explain the answer more!!!!!!!!!!!!!
October 26, 2014

Math
how did you get 900?
October 26, 2014

Math
10. Estimate 30% of the student population. You must show all of your work and provide an explanation. *There are 850 students.
October 26, 2014

Math
What does the word benchmark percent means?
October 18, 2014

Algebra 2
write an equation to solve each problem Briana and her sister Molly want to buy the same model bicycle. Briana needs $73 more before she can afford the bike. Molly needs $65 more. If they combine their money, they will have just enough to buy one bicycle that they could share...
October 15, 2014

Math
What percent o the student population are girls? Please show work! There are 22 girls
October 13, 2014

Math
There are 22 girls
October 13, 2014

Math
What percent o the student population are girls? Please show work!
October 13, 2014

Chem AS
When either chlorine or hydrogen chloride is passed over a heated metal M, the same chloride is produced. An aqueous solution of this chloride is acidic. Which one of the following could be M? A: Al B: Ba C: Cu D: Fe E: Na Ans: A Help w explanation please! Thanks!
October 6, 2014

Chem AS
On addition of aqueous sodium hydroxide to an aqueous solution of salt R, a white precipitate is obtained, soluble in an excess of the hydroxide. A white ppt is also obtained when R is treated with aqueous ammonia , but it is insoluble in excess. Which of the following could ...
October 6, 2014

Physics Resistance
A piece of wire of resistance, R and uniform cross sectional area, A is cut into four equal parts and bundled together to form a thicker wire. The resistance of the bundled wire is: A 16R B 1/4R C 4R D 1/16R It's either 16 or 1/16 im not sureee. So I need help for the ...
October 5, 2014

Physics
Two sources of equal amplitude undergo interference the energy at maxima is four times that due to either source is this a violation of the principle of conservation of energy. Explain. Can someone help me summarize a good model answer and further explanation of the answer? ...
October 5, 2014

AS Physics
A driver leaves his car without applying the hand brakes on a road inclined at an angle of 25 degrees. The car starts to roll down the road with the driver chasing from behind after moving a distance of 20 m the speed of the car is 5.0 ms-1. Calculate the coefficient of static...
October 4, 2014

Chem
Cyanohydrins can be made from carbonyl compounds by generating CN- ions from HCN in the presence of a weak base. In a similar reaction, -CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an Aldehyde and CH3CO2CH3? Option 1 : ...
September 30, 2014

Chem Help!
The presence of 11-cis retinal, C20H28O, in cells in the eye is important for vision. The structure of retinal includes an aldehyde group, a cyclohexene ring and a long aliphatic side chain, in which a carbon-carbon double bond exists between carbons numbered 11 and 12. Which ...
September 30, 2014

CHEM HELP!
A car burning lead-free fuel has a catalytic converter fitted to its exhaust. On analysis its exhaust gases are shown to contain small quantities of nitrogen oxides. Which modifications would result in lower exhaust concentrations of nitrogen oxides? 1 an increase in the ...
September 30, 2014

Chem Help!
Which pair of reagents will take part in a redox reaction? A CH3CH2OH + concentrated H2SO4 B CH3CHO + Tollens’ reagent C CH3CO2C2H5 + dilute H2SO4 D CH3COCH3 + Fehling’s solution Ans: B Someone please explain! Thanks! :)
September 30, 2014

Chem help
Which reaction of ammonia does not involve the non-bonding pair of electrons on the nitrogen atom? A NH3(g) + CH3I(g) → CH3NH 3+ I –(s) B NH3(g) + HCl (g) → NH4Cl (s) C 2NH3(l) + 2Na(s) → 2NaNH2(s) + H2(g) D 2NH3(aq) + Ag+(aq) → [Ag(NH3)2]+(aq) ...
September 28, 2014

Chemistry
Which process could be used to calculate the bond energy for the covalent bond X-Y by dividing its ∆H by n? A XYn(g) → X(g) + nY(g) B 2XYn (g) → 2XYn-1(g) + Y2(g) C Y(g) + XYn-1(g) → XYn(g) D nXY(g) → nX(g) + n/2 Y2(g)
September 21, 2014

CHEM HELP :(
The presence of 11-cis retinal, C20H28O, in cells in the eye is important for vision. The structure of retinal includes an aldehyde group, a cyclohexene ring and a long aliphatic side chain, in which a carbon-carbon double bond exists between carbons numbered 11 and 12. Which ...
September 20, 2014

CHEM HELP PLEASE!
Cyanohydrins can be made from carbonyl compounds by generating CN– ions from HCN in the presence of a weak base. In a similar reaction, –CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an aldehyde and CH3CO2CH3 in the ...
September 20, 2014

pre algebra
1. what is the sum of 5/6 + 2/3? a.1 1/3 b.1 1/2 c.1 2/3* d.1 3/4 2. sylvia has 6 1/2 boxes of chocolate to share at a family picnic. if she gives each person 1/3 of a box, how many people can receive chocolate? a.13* b.17 c.19 d.21 my answer=* please explain how you got your ...
September 19, 2014

Chemistry Help!
Cyanohydrins can be made from carbonyl compounds by generating CN- ions from HCN in the presence of a weak base. In a similar reaction, -CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an Aldehyde and CH3CO2CH3? Option 1 : ...
September 19, 2014

Chen help!
Cyanohydrins can be made from carbonyl compounds by generating CN- ions from HCN in the presence of a weak base. In a similar reaction, -CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an Aldehyde and CH3CO2CH3? Option 1 : ...
September 19, 2014

Chem
The presence of 11-cis retinal, C20H28O, in cells in the eye is important for vision. The structure of retinal includes an aldehyde group, a cyclohexene ring and a long aliphatic side chain, in which a carbon-carbon double bond exists between carbons numbered 11 and 12. Which ...
September 19, 2014

Physics help please!
Explain why the sum of the masses of the uranium nucleus and of the neutron does not equal the total mass of the products of the reaction. I guess its a theory question. Someone please explain!
September 12, 2014

Physics Help!
The Fly wheel has a small magnet of mass M mounted on it. Each time the magnet passes the coil, a voltage pulse is generated , which is passes to the c.r.o the display of the c.r.o is 10 cm wide . The flywheel is rotating at a rate of about 3000 revolutions per minute . Which ...
September 11, 2014

Chemistry
The relative molecular mass of a molecule of chlorine is 72. Which properties of the atoms in this molecule are the same? 1 radius 2 nucleon number 3 relative isotopic mass Answer: 1 only Can someone please explainnn! Thanks :)
August 26, 2014

Chem
Cyanohydrins can be made from carbonyl compounds by generating CN– ions from HCN in the presence of a weak base. In a similar reaction, –CH2CO2CH3 ions are generated from CH3CO2CH3 by strong bases. Which compound can be made from an aldehyde and CH3CO2CH3 in the ...
August 25, 2014

AS Chemistry
which ions are present in a solution of ethanol in an excess of concentrated sulphuric acid? 1 CH3CH2O- 2 CH3CH2OH2 3 HSO4- Explain please! Thanks :)
August 22, 2014

Chemistry
Full question: An alcohol of molecular formula C4H10O2 contains two OH groups and has an unbranched carbon atom chain. On reaction with excess hot potassium permanganate this alcohol is converted into a compound of molecular C4H6O4 To which carbon atoms in the chain of the ...
August 22, 2014

Pure Maths
Answer is dh/dt= m/min The volume when it's 1/8th full is Pi/12 I don't understand how they got that....
August 16, 2014

Pure Maths
I understand the rest but not the 1/8th of the volume part. Can you give me a further explanation on that? Thanks :)
August 16, 2014

Pure Maths
A container is in the shape of a right circular cone (inverted) with both height and diameter 2 meters. It is being filled with water at a rate of (pi)m^3 per minute. Fine the rate of change of height h of water when the container is 1/8th full(by volume). (Volume of a right ...
August 16, 2014

statistics
The students in your class with three children in their families are asked to state the number of boys in the family. What are the possible numbers? If X is the number of boys minus the number of girls in each of these families, state all the possible values of X. Make a table...
August 4, 2014

Physics
An astronaut of mass m in a spacecraft experiences a gravitational force F=mg when stationary on the launchpad. What is the gravitational force on the astronaut when the spacecraft is launched vertically upwards with an acceleration of 0.2g? A 1.2mg B mg C 0.8mg D 0 Ans= B ...
July 1, 2014

Maths!
Find the sum of all multiples of 5 between 100 and 300 inclusive. Ans: 8200 I do not know how to do this. Really do appreciate step by step workings and explanation. Thanks!
June 7, 2014

Statistics
How do you get 738/999??
June 6, 2014

Statistics
The registration numbers of vehicles in a certain country use digits 1-999. If a visitor has just entered the country. What is the probability that the first car he sees has at least 2 identical digits? Ans: 29/111
June 6, 2014

Physics
Intensity is the same? But the question states that it is halved? I don't quite get it........
June 5, 2014

Physics
A person is initially 8 m from a point sound source which emits energy uniformly in all direction at a constant rate. If the intensity of the source is to be halved but the sound is to be as loud as before, what distance should the person be from the source? Ans: 4 square root...
June 5, 2014

Physics
Two blocks A and B are connected by a light in extensible cord passing over a frictionless pulley. Block A starts from rest and moves up the smooth plane which is inclined at 30 degrees to the horizontal. Calculate at the moment that A has moved 4 m along the plane. (a) the ...
June 1, 2014

Geometry
All square and all rectangles are equilateral?
March 24, 2014

Geometry
thank you
March 24, 2014

math
Mrs. Zimmerman spent $55 at the grocery store. 40% of that she spent on meat. How much did she spent on meat?
February 25, 2014

Maths
Still don't think this is right. Mortgage is for $300,000 for 30 years, Fixed interest rate = 7% per year. Annual payments = $23,500 At end of 30 years, must make balloon payment. How much is the balloon payment? My teacher said it will be like making 3 payments at the end.
February 12, 2014

Maths
Mortgage is for $300,000 for 30 years, Fixed interest rate = 7% per year. Annual payments = $23,500 At end of 30 years, must make balloon payment. How much is the balloon payment?
February 12, 2014

pre a-p math
a playground is 100ft by 150 ft. you want to make a scale drawing of the playground on a 8.5 by 11 paper what scale could you use? please help
February 5, 2014

Math
The temperature at 6 a.m was 3° f. At noon it was it was 10° f. What was the change in the temperature ?
January 8, 2014

pre algebra
a 28 foot flagpole cast a shadow 95 feet long. a nearby person cast a shadow 17.5 feet long. how tall is this person
December 16, 2013

Maths
Thanks for your reply. The answer is correct!
November 21, 2013

Maths
I have a diagram in which AB is a vertical cliff. BC is a vertical building 80m in height. P is a point on level ground 200m away from A. The angle of elevation of the bottom of the building from P is 44 degrees. What is the angle of elevation of the top of the building from P?
November 21, 2013

math
DVD cases are 9/16" wide. If Juan has 60 DVDs, how many will fit on a 2 1/2 feet long shelf?
September 30, 2013

English 12
Yes my teacher assigned it today but I get it now, thank you!
September 9, 2013

English 12
"Dressing up for the Carnival" by Carol Shields Comment on the title of the story. What is "the carnival"?
September 9, 2013

geometry
a 27 feet tall ladder is placed so that it reaches 25 feet up on the wall of the house. How far is the base of the ladder from the wall of the house. Please help.
September 1, 2013

geometry
round to the nearest tenth. a rectangular plot of land is 80 meters wide and 98 meters long. Find the length of the diagonal and if necessary, round to the nearest tenth.
September 1, 2013

Math
You will be designing a park your park must contain the following a rectangle 100yds x 120yds . A picnic n playground area must be add up to be at least 1/2 of the park the picnic area must have a circular garden
May 24, 2013

language
Alright so all of those who look at this and have the same questions this should all be the same! Don't think just because you don't have the same class with them that the answers might be different. The answer for #1 is c and #2 is b. I took the assessment and I ...
May 12, 2013

Language arts plz help~!
Hello, I'm not from ur school but I get the same questions and answers as ur curriculum. I had this same assessment and for #2 Mrs. Sue is correct, it is stage directions. I know this because I took a shoot in the dark and went for stage directions instead of teleplay and ...
April 25, 2013

Math
Dr. Michael Lewis bought a bike that cost $455 plus 7 1/2 percent sales tax. Find the final cost
April 18, 2013

Math
Jessica wants to seed her backyard with grass seed. Her yard is 120 fet long and 90 feet wide. If Jessica buys bags of seeds that cover 600 square feet, how many bags of seed will she need?
April 17, 2013

Physics
A 4.1 kg bundle starts up a 31° incline with 148 J of kinetic energy. How far will it slide up the incline if the coefficient of kinetic friction between bundle and incline is 0.39?
April 7, 2013

Physics
You drop a 1.60 kg book to a friend who stands on the ground at distance D = 12.0 m below. If your friend's outstretched hands are at distance d = 1.40 m above the ground (see the figure), (a) how much work Wg does the gravitational force do on the book as it drops to her ...
April 7, 2013

chemistry
how do i balance SO3 + H2O = H2SO4
March 7, 2013

Math
Create 4 proportions that will work for the following scenario: If the scale is 3.5 in = 8 ft and the drawing measures 6 in, what is the actual distance?
November 19, 2012

Physics
A uniform ladder of length L and mass m leans against a frictionless vertical wall, making an angle of 56° with the horizontal. The coefficient of static friction between the ladder and the ground is 0.36. If your mass is four times that of the ladder, how high can you ...
November 19, 2012

History---Modern World History
Thank you so much!!! I really don't understand my teacher very well. She tries to explain but it makes no sense. I wrote a 7 paragraph essay on a total different subject one time, I ended up having to write it all over again.. Completely differently. Thanks again for your ...
November 1, 2012

History---Modern World History
Write a short paragraph that traces the rise of Japan from an isolated society to a major industrial and imperial power. I'm good at writing paragraphs but I really don't understand the question! If someone could explain to me what my teacher wants and how I should go ...
November 1, 2012

social stody
what parts of canada are good for growing crops
October 23, 2012

chemistry
If 0.500 mol NaN3 react, what mass in grams of nitrogen would result?
October 23, 2012

6th grade math
im studying exponents. 50 is my result number How did I get using exponents
August 29, 2012

CHEM
Pu-239 has a half-life of 24110 y. If 1.00 kg of this isotope is present in the used fuel rods of a nuclear power plant approximately how long will it take for this amount of Pu-239 to decay until there is less than 1 mg left ? Please help. I do not know how to do this question.
March 14, 2012

accounting
1. Describe the roles and responsibilities of management and independent auditors in the financial reporting process 2. Define the following three users of financial accounting disclosures and the relationships among them: a) Financial analysts b) Private investors c) ...
October 31, 2011

Chemistry
The boiling points of the following compounds increase in the order in which they are listed below: CH4 < H2S < NH3 Discuss the theoretical considerations involved and use them to account for this order.
March 23, 2011

Chemistry
If you were given 0.021 milligrams of the compound,H3PO4, what would the mass of H in the sample be?
February 16, 2011

Math
Write an equation of the line satisfying the given conditions Parallel to the line y=-4x+3 and a y intercept of -5 Please help I am really confused
February 13, 2011

geometry
I NEED HELP ON MY mATH!!!!!
January 5, 2011

algebra 1
a roll of carpet 9 ft wide is 30 ft longer than a roll of carpet 15 ft wide. both rolls have the same area. make a sketch and find the dimensions of each.
October 28, 2010

chem
Why do you think water is often called the universal solvent and what makes it such a good solvent?
May 29, 2010

chemistry
Why are the published values of the boiling points of substances always taken at 1 atm?
May 25, 2010

chemistry
Why are the published values of the boiling points of substances always taken at 1 atm?
May 25, 2010

Chemistry
(True or False) Wax is nonpolar, yet it exists as a solid at room temperature. Its solidity is best explained by the presence of dispersion forces.
May 20, 2010

chemistry
What type of intermolecular forces would you expect to find between molecules of H2O? of BrCl? of hexane (C6H14)?
May 20, 2010

Chemistry
How are the three types of intermolecular forces similar? How are they different?
May 20, 2010

Business
The U.S. cigarette industry has negotiated with Congress and government agencies to settle liability claims against it. Under the proposed settlement, cigarette companies will make fixed annual payments to the government based on their historic market shares. Supposed a ...
May 17, 2010

Business
This is all the information given in the problem. It does not give the average occupancy rate in the summer.
May 17, 2010

Business
A New Hampshire resort offers year-round activities: in winter, skiing and other cold-weather activities; and in summer, golf, tennis, and hiking. The resorts operating costs are essentially the same in winter and summer. Management charges higher nightly rates in the winter, ...
May 17, 2010

Managerial Economics
As vice president of sales for a rapidly growing company, you are grappling with the question of expanding the size of your direct sales force (from its current level of 60 national salespeople. You are considering hiring from 5 to 10 additional personnel QUESTION: How would ...
May 15, 2010

Chemistry
How are mm Hg, torr, psi, atm, and Pa related to each other mathematically?
May 1, 2010

chemistry
How are mm Hg, torr, psi, atm, and Pa related to each other mathematically?
May 1, 2010

chemistry
Why is carbon dioxide gas that carbonates fountain drinks stored in sturdy canisters?
May 1, 2010

Math
Leah liked to balance objects she found around the house using the science kit she got for Christmas. She found that 3 identical apples and a 5-gram weight exactly balanced a 50-gram weight. Leah said she could tell how much each apple weighed by solving the equation 3a+5=50. ...
April 19, 2010

Global History
thank you
March 24, 2010

Global History
reasons/causes why there was a fight for the holy land christians vs muslims.
March 24, 2010

math 115
evaluate: 30/5x3-2 --------- 2-2/3 ( /= divided by) is the correct answer 16/-4?
November 3, 2009

Math
Thanks ! Just wanted to make suree (:
September 16, 2009

Math
Alice has five shirts and three ties. How many possible outfits consisting of one shirt and one tie does he have?
September 16, 2009

history
What is Anne franks legacy?
January 26, 2009

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