Friday
December 19, 2014

Posts by Sarah


Total # Posts: 4,457

History
True or False. (If false correct it) The ancient Greeks were interested in philosophy, not nature,so they did little to advance scientific knowledge. Please help! Thank you :)
May 24, 2013

Geometry
Find the volume of a rectangular box. The faces have areas of 15, 25, and 60.
May 22, 2013

Math Geometry
How do you put your knowledge of quadrilaterals to kites?
May 22, 2013

Please answer this question as soon as posibble
I did the paraphrases for the story is it the correct way. Lifeguard Assignment Chris doesn’t like children, but he works as lifeguard at the Brigeland Community swimming. He does not like children a lot, but he is working as a lifeguard at the Brigeland Community ...
May 22, 2013

English Please answer ASAP
I did the paraphrases. I want to know is it the correct way r no
May 22, 2013

English Please answer ASAP
Lifeguard Assignment Chris doesn’t like children, but he works as lifeguard at the Brigeland Community swimming. He does not like children a lot, but he is working as a lifeguard at the Brigeland Community swimming pool. He spends most of his time at the swimming pool. It...
May 22, 2013

Calculus II
Find the sum of the series (infinity above sigma) signma and n = 4 3^n-2 divided by 2^2n-3 please I really need help on this
May 20, 2013

statistics
Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that has 500,000 people. ...
May 20, 2013

statistics
Suppose you are trying to estimate the percent of women in a city. Other things being equal, a simple random sample of 0.1% of the population of a city that has 2,000,000 people is ________ as a simple random sample of 0.1% of the population of a city that has 500,000 people. ...
May 20, 2013

Algebra
PLEASE
May 20, 2013

Algebra
A triangle has an area of 60 in^2. Its base is 10 inches and its height is √x inches. What is the value of x? What is the height of the triangle? Please show all work that you use to determine your answer. (Hint: The formula for the area of a triangle is A= 1/2bh where b...
May 20, 2013

world geography
i need help with number 16. can anyone help me?
May 19, 2013

Math
Sarah was given a sum of money. She spent the same amount of money each day. She spent 2/7 of her money in 6 days. After another 5 days, she had $20 left. How much money did she have at first.
May 19, 2013

mathematic
ans of c ???? is 1 ????
May 18, 2013

statistics
its wrong :(
May 18, 2013

statistics
can any one tell me the ans of D plz ???
May 18, 2013

physic
1. Given the following velocity-time graph: V-T Graph 10 Velocity, m/s 5 10 15 Time -10 a. Calculate the displacement at the end of 20 seconds.
May 16, 2013

Geometry
A simple graph G has 200000 edges and for any 3 vertices v,w,x, at least one of the edges vw,wx,xv is not present in G. What is the least number of vertices that G can have?
May 16, 2013

Math
The squares of a 2×500 chessboard are coloured black and white in the standard alternating pattern. k of the black squares are removed from the board at random. What is the minimum value of k such that the expected number of pieces the chessboard is divided into by this ...
May 16, 2013

Physics
Two point charges +q=1 ìC and −q=−1 ìC with mass m=1 g are fixed at the positions ±r ⃗ 0 with |r 0 |=1 m . The charges are released from rest at t=0 . Find the time ô in seconds at which they collide.
May 15, 2013

Algebra
What is the largest prime factor of 5^8 +2^2 ?
May 15, 2013

Calculus help!
Describe the following surface and give traces where available: 16x^2 + 16y^2 - 9z^2 = 0
May 10, 2013

physics
the gravity on mars is 3.69 meters/second^2. if you had a pendulum on mars that was 1.8 meters long. what would the period be?
May 8, 2013

Chemistry
Which two elements is the second transition series (y through Cd) have four unpaired electrons in their 3+ ions?
May 7, 2013

Chemistry
An unknown solid acid is either citric acid or tartaric acid. To determine which acid you have, you titrate a sample of the solid with NaOH. The appropriate reactions are as follows: Citric acid: H3C6H5O7 (aq) + 3NaOH (aq) -> 3H2O (l) + Na3C6H5O7 (aq) Tartaric acid: ...
May 7, 2013

Chemistry
Estimate how many microwave photons with 1=12 cm must be absorbed to raise the temperature of your eye by 3 degree C. Assume the mass of an eye is 11 g and its specific heat capacity is 4.0 J/g/k
May 7, 2013

geomerty
Find the area of the regular polygon. Round your answer to the nearest tenth. the individual sides are 10 the radius is 13.07
May 4, 2013

math
would it be 3 pi 4 sq units
May 4, 2013

Physics
Here's a neat trick. If your average ceramic bowl has a mass of 200 g, what is the difference in Newtons between the weight of the bowls on the top of her head before and after she does the trick?
May 4, 2013

chem
Chromium(III) chloride(aq) + potassium sulfide(aq) what are the products of this reaction
April 30, 2013

chem
takes 190. seconds for a sample of carbon dioxide to effuse through a porous plug and 295 seconds for the same volume of an unknown gas to effuse under the same conditions. What is the molar mass of the unknown gas? Enter your answer to 3 significant figures.
April 29, 2013

Biology
Is 9th grade biology hard? Is it interesting...?? I love life science but I just wondering if 9th grade biology hard??? I'm taking biology next year.
April 29, 2013

Science 8R - help!
why... would I ask for geography this have something to do with SCIENCE (aka food webs) What is consumers???
April 29, 2013

chem
For the following combination of reactants, enter the formulae of the products in the space provided and give their states. (Separate multiple products with a comma ",". Type your answer using the format Na2SO4(aq) for Na2SO4(aq). Do not balance the equation. If ...
April 28, 2013

chem
oops just the last part
April 28, 2013

chem
I actually figured out how to do that one. but i have another one Question Part Points Submissions Used 1 –/1 0/4 Total –/1 .This question has some parts which are scored using special conditions. Question Part 1: A deduction of 10% of the points for this question ...
April 28, 2013

chem
How many grams of TiCl4 are needed to produce 17.8 g of titanium? what equation do i use?
April 28, 2013

Algebra
A freight train leaves Chicago traveling West at 35 mph. An hour later a passenger train leaves Chicago traveling on a parallel track at 60 mph. How far from Chicago will the passenger train catch up to the freight train?
April 28, 2013

L.o
Identify nd describe 3 environmental health hazards tht cause ill health,crises nd disasters in south africa?
April 28, 2013

chem
The half-life of is 30.0 days. What fraction of a sample of this isotope will remain after 16.2 days?
April 27, 2013

math
if 1,x,y is a geometric sequence and x,y,3 is an arithmetic sequence, compute the maximum value of x+y
April 27, 2013

chem
What is the empirical formula of the compound with a mass percent composition of 70.0% Fe and 30.0% O? (Type your answer using the format CH4 for CH4
April 27, 2013

chem
What is the empirical formula of the compound with a mass percent composition of 70.0% Fe and 30.0% O? (Type your answer using the format CH4 for CH4
April 27, 2013

chemistry
Given the thermochemical equation below, calculate the amount of energy released when 250. g of NaOH (molar mass = 40.0 g/mol) reacts with an excess of HCl. Report answer to the correct number of significant figures in units of kilojoules, kJ. NaOH + HCl --> NaCl + H2O ...
April 25, 2013

math
for for like a. it would be (2, 4) and (-1, 1)?
April 23, 2013

math
find the points of intersection of the following pairs of equations. a. y=x^2 and y=x +2 b. y=x^2 and y=8-x^2 c. y=x^2 and x=y^2
April 23, 2013

history
which president raises soft money in order to help democrat candidates in the 1996 election
April 23, 2013

Physics Eletric fields and coulomb's law)
Can someone solve this please
April 22, 2013

constitution/essay
Write your paper about a hypothetical proposal that is before the elected school board for the public schools in your city. The proposal stirs deep controversy in the community. Opponents claim that it would violate the Constitution’s prohibition against an “...
April 22, 2013

CHEMISTRY
Suppose a student adds 25.00 mL of 1.025 M HCl to a 1.50 g antacid tablet. The student boils and then titrates the resulting solution to the endpoint with 0.4969 M NaOH. The titration requires 21.3 mL NaOH to reach the endpoint. How many moles of HCl were neutralized by the NaOH?
April 22, 2013

Science Help! Ms. Sue Please!
8. Which of the following explains why the chemical products from a reaction have a different mass than the chemicals at the beginning? The products are heavier and sink. The products are lighter and rise. The products are a gas and escape into the air. The products are a ...
April 22, 2013

math
1)find the sum of the odd integers from 25 to 75 2)find the sum of the first 20 terms in the series 10+5+2.5+1.25... . please show the steps to solve the problem^_^
April 22, 2013

chemistry
i responded on it but i dont think you saw it
April 21, 2013

chemistry
If 10.4 liters of O2 at STP are produced by the electrolysis of water, how many coulombs of charge were required?
April 21, 2013

chem
i got 89593.2 but its wrong
April 20, 2013

chem
If 10.4 liters of O2 at STP are produced by the electrolysis of water, how many coulombs of charge were required?
April 20, 2013

chem
A hydrogen-oxygen fuel cell operates on the simple reaction given below. H2(g) + 1/2 O2(g) H2O(l) If the cell is designed to produce 1.8 A of current, and if the hydrogen is contained in a 2.9 L tank at 200. atm pressure at 25°C, how long can the fuel cell operate before ...
April 19, 2013

chemistry
what is the word and balanced chemical equation for oxalic acid and marble?
April 18, 2013

chemistry help!!
nsider the following electochemical cell. Pt | Cr3+ (2.7010-4 M), Cr2+ (0.500 M) || Pb2+ (0.0710 M) | Pb Calculate the voltage of the cell, Ecell, including the sign.
April 17, 2013

Finance
Andy's total assets are $2,500,000, net profit margin is 5% of sales, dividend payout ratio of 60%, and the ratio of its spontaneous liabilities to sale is 20%. If sales rise from their present level of $5 million by%1,000,000 next year, what will be the firms needs for ...
April 17, 2013

Finance
anderson inc has 5,000,0000 debt at 10% per year, sale of 10,000,000, a tax rate of 40% and a net profit margin of 6%, what is anderson's times interest earned ratio?
April 17, 2013

science
Pt | Cr3+ (2.7010-4 M), Cr2+ (0.500 M) || Pb2+ (0.0710 M) | Pb Consider the following electochemical cell. Calculate the voltage of the cell, Ecell, including the sign.
April 17, 2013

chem
In acidic solution copper(I) ion is oxidized to copper(II) ion by nitrate ion. I got Cu^+(aq) + NO_3^-(aq) --> Cu^2+(aq) + NO_3^2-(aq)but itswrong
April 17, 2013

chem
for the E0cell i got 2.35 and for Q i got 8.186 then when i plugged that into the equation i get 2.7101V is that correct? I plugged 1 in for n.
April 16, 2013

chem
3 Ce4+(aq) + Cr(s) ¨ 3 Ce3+(aq) + Cr3+(aq) What is the emf of this cell when [Ce4+] = 2.9 M, [Ce3+] = 0.11 M, and [Cr3+] = 0.015 M?
April 16, 2013

chemistry
If the equilibrium constant for a one-electron redox reaction at 298 K is 7.8 104, calculate the corresponding ÄG° and E°cell. how would i set this problem up?
April 16, 2013

BIO
You can easily do this by using a biology textbook or searching it on google.
April 14, 2013

chemistry
then do you subtract the given cell potential from that?
April 14, 2013

chemistry
A voltaic cell that uses the reaction Tl3+(aq) + 2 Cr2+(s) ¨ Tl+(aq) + 2 Cr3+(aq) has a measured standard cell potential of +1.19 V. determine E‹red for the reduction of Tl3+(aq) to Tl+(aq).
April 14, 2013

calculus
Find the length of the curve over the given interval: x=t+1 y=ln cos(t) for t=0 ---> t=pi/4
April 14, 2013

precalc
1. A plane is headed at 122 degrees with an air speed of 350mph in a wind that is blowing from 38 degrees. Find the ground speed of the plane and the speed of the wind if the actual flight was at 133 degrees. 2. A plane is heading at 20 degrees at 300mph If a wind is blowing ...
April 14, 2013

Histroy
Religious tolerance
April 14, 2013

chem
would it be this? Cd(s) + Cl2(g) + 2e==> Cd^2+(aq) + 2e + 2Cl^-(aq)
April 13, 2013

chem
y dont you use Pt for the second equation?
April 13, 2013

chem
A voltaic cell consists of a strip of cadmium metal in a solution of Cd(NO3)2 in one beaker, and in the other beaker a platinum electrode is immersed in a NaCl solution, with Cl2 gas bubbled around the electrode. A salt bridge connects the two beakers. Write the equation for ...
April 13, 2013

ap chemistry
The volume of 0.100 mol of helium gas at 34°C is increased isothermally from 1.00 L to 4.50 L. Assuming the gas to be ideal, calculate the entropy change for the process.
April 12, 2013

chem
La(s) ¨ La(OH)3(aq) (basic solution) Complete and balance the following half-reactions
April 11, 2013

Tourism Industry
Which of the following is a key tourism management challenge caused by the seasonality of demand, but greatly impacting service quality? A. revenue share B. loyalty systems C. access restrictions D. condo rating systems E. human resource scheduling
April 9, 2013

tourism industry
Governments invest in many different industries, including the tourism industry. As a result, economic impact studies are conducted to assess the ______________ of this government spending. A. TFC B. TSA C. MUI D. ROI E. TEI
April 9, 2013

chem
hoiw do you know that? is it teh only one?
April 9, 2013

chem
From the following list, identify the ions that are more easily reduced than H+. Fe2+(aq) Al3+(aq) Cr3+(aq) Ag+(aq) Sn4+(aq)
April 9, 2013

HISTORY
how did the US support Diem's regime between 1954-1964?
April 8, 2013

Newton's Laws
1. An 1760 kg car is moving to the right at a constant velocity of 2.94 m/s. (a) What is the net force on the car? (b) What would be the net force on the car if it were moving to the left? 2.A freight train has a mass of 6 107 kg. If the locomotive can exert a constant pull of...
April 8, 2013

chmistrye
Using the data in this table of the thermodynamic quantities for selected substances and given the pressures listed, calculate ƒ¢G at 25‹C for each of the following reactions (a) N2(g) + 3 H2(g) ¨ 2 NH3(g) PN2 = 2.0 atm, PH2 = 5.4 atm, PNH3 = 2.2...
April 7, 2013

chem
what is the Ka equation for HCHO2 i thought it was K_{a} = [CHO_2][H^+]/[HCHO_2] but its not correct
April 7, 2013

history
Why did the US intervene in Vietnam, during the Vietnam War, and support Diem's regime for econommic reasons? Not only for America's own good but for what else?
April 7, 2013

chemistry
How many Cl atoms are in a 2.54g sample of CCl4?
April 6, 2013

math
Jose, Paul,and Dan went fishing. It was a good day, and all three of them caught a fish. Dan's fish weighed four times as much as Paul's fish, and Jose's fish weighed half as much as Dan's fish. Altogether, the three fish weighed 21 pounds. How much did each ...
April 5, 2013

english/writing
thank you both! :)
April 5, 2013

english/writing
i want to say that the novel is a transcendentalist story of the strength of individual character
April 5, 2013

english/writing
how can i reword this sentence differently and better? it sounds wrong to me. In conclusion, The Scarlet Letter is a transcendentalist novel of the strength of individual character.
April 5, 2013

Science
How does heart rate increase? Does it double? Does it increase with the intensity of the workout? I already know the background of heart rate but have trouble with the questions above.
April 4, 2013

english/writing
Sounds so much better....Thank You! :)
April 4, 2013

english/writing
how can i write this sentence in a different way The Scarlet Letter was one of the first mass-produced books in the United States upon its release in 1850, and it received much praise and criticism for the novels supposed morbidity.
April 4, 2013

math
jose, Paul, and Dan went fishing. It was a good day,and all three of them caught a fish. Dan's fish weighed four times as much as Paul's fish, and Jose's fish weighed half as much as Dan's fish. Altoghther, the three fish weighed 21 pounds. How much did each ...
April 4, 2013

math
what percent of 6,350 is 1,397?
April 4, 2013

English/writinh
Im having a hard time starting my introduction for my essay. I already wrote my thesis statement which is: " In Nathaniel Hawthorne’s, The Scarlet Letter, it suggests that one must find their own internal strength and strive for individual redemption by applying the ...
April 2, 2013

chemistry
If a 1.59 mole sample of argon occupies 3.07 L at constant temperature and pressure then what volume will 4.35 moles of argon occupy at the same conditions?
April 2, 2013

Physics
d = 1/2 (a)(t)^2 = 160 m at rest, Vo = u = 0 m/s I found the final velocity by using v = u +at = 0 + (20)(4) = 80 m/s d = vt t = 160 m / 80 m/s = 2 s I might be wrong at this I know d= Vot - 1/2 (a)(t)^2 By any chance, what textbook are you using?
April 1, 2013

Science Physics
An object weighs 12 N on earth. When it is brought to Mars, it has a weight of 4.8 N. What is the acceleration due to gravity on Mars? (Taking the acceleration due to gravity on earth is 10 m/s²)
April 1, 2013

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