Wednesday
September 17, 2014

Posts by Rachel


Total # Posts: 1,181

chemistry
Lead is often found in Earth's crust as several lead compounds. Calculate the mass in kilograms of the amount of each of the following lead compounds that contains 4500kg of lead. 1)PbCO3 (cerussite) 2) PbSO4(anglesite)
October 26, 2010

chemistry
What volume of each of the following solutions contains 0.13mol of KCl? 1).345M of KCl 2)2.0M of KCl 3).895M of KCl
October 26, 2010

chemistry
How many liters of a 0.530M sucrose (C12H22O11) solution contain 1.3kg of sucrose?
October 26, 2010

chemistry
A chemist wants to make 3.1L of a 0.104M solution. How much KCl in grams should the chemist use?
October 26, 2010

french
Could you check these thanks. Directions: Répondez en utilisant un pronom (en). 1. Il y a combien de chambres dans cet hôtel? (cent) Answer: Il y en a cent. 2. Il y a combien de lits dans chaque chambre? (deux) Answer: Il y en a deux 3. Il y a combien de placards ...
October 18, 2010

calculus
find the points on the graph of y=secx where the tangent is parrallel to 6y-4x=8. (0 is less than or equal to x and x is less than or equal to 2pi). Use exact values.
October 14, 2010

math
A ball is thrown upward from a height of 100 ft. with an initial velocity of 80 ft/sec. Find the function.
October 14, 2010

Persuasive Topic help
For my speech class we need to make a speech on a persuasive topic that will be interesting and fun to hear. It needs to be a topic that no one ever really talks about, or something that no one really knows about. For example pregnancy is something we already know. Can you ...
October 14, 2010

french
Can you check these thanks. Part 1 Directions: Répondez selon le modèle. Elle va souvent à Montréal? Oui, elle y va souvent. (As you can see we are now learning the pronoun y) 1. Ils vont souvent à Paris? Answer: Oui, ils y vont souvent. 2. ...
October 14, 2010

Chemistry
I am required to design an experiment which will allow me to produce exactly 12.5g of pure dry Copper Hydroxide. I need to include equipment required, Chemicals required, step by step method and any particular limitations/cautions which must be exercised whilst following the ...
October 12, 2010

SraJMcGin
Correction: I don't know when I'm supposed to add an extra e or ees. Can you give me examples. Thanks so much
October 12, 2010

SraJMcGin
Can you help me with the passé composé: être and avoir. I understand when to use être and avoir but I don't know if I'm supposed to add an extra e or ees for the verbs.
October 12, 2010

french
Can you check these also thanks. Directions: Récrivez les phrases au passé composé. Le passé composé: être ou avoir. 1. Marie monte au troisième étage. Answer: Marie est monté au troisimème êtage. 2. ...
October 12, 2010

french
Can you check these it's based on Le passé composé: être ou avoir. Directions: Complétez au passé composé Les deux copines -----1------ (sortir) de la maison à neuf heures. Elles ------2------ (sortir) tous leurs bagages. ...
October 12, 2010

6th grade
Look up the word "culture."
October 8, 2010

economics
qs=-400+2p qd=1600-2p how do i graph that
October 7, 2010

science
is a rock a compound, element, or solid?
October 6, 2010

Gen Chem 1
A tanker truck carrying 2.01×10^3kg of concentrated sulfuric acid solution tips over and spills its load. The sulfuic acid is 95.0% H2SO4 by mass and has a density of 1.84g/L. Sodium Carbonate (Na2CO3)is used to neutralize the the sulfuric acid spill. How many kilograms ...
October 6, 2010

French (need a website link quick question)
I need a website link that will give me a practice test to Qu'est-ce qui and Qu'est-ce que. Where Qu'est-ce qui acts as a subject and Qu'est-ce que acts as an object. I also need a test on negative and affirmative commands. For example: Montrez-moi-la radio ...
October 4, 2010

Linear Equations
Can you check these thanks. Linear Equations Directions: Write each equation in standard form. 1. y=7x-5 Answer: 7x-y=5 2. y=3/8+5 (3/8 is a fraction) Answer: 3x-8y=40 3. x= -2/7y+3/4 Answer: x+14y=12 4. 3y-5=0 Answer: x+3y=0 Find the x-intercept and y-intercept of the graph ...
October 2, 2010

Literature
Can I get your opinion on the story Sinner's in the Hands of An Angry God. What would be your personal response of this story. (I just need an idea)
September 29, 2010

Literature question
Can you give me a summary to the story Sinners in the Hands of an Angry God? Thanks. By the way if you do give me a link please don't give me a google link because for some reason my computer doesn't want to pull up google's homepage. Thanks.
September 29, 2010

physic
how to caluate a ke vs. time graph
September 28, 2010

college physics
A freight train has a mass of 1.7 multiplied by 107 kg. If the locomotive can exert a constant pull of 7.4 multiplied by 105 N, how long does it take to increase the speed of the train from rest to 68 km/h?
September 21, 2010

Chemistry
The pressure of 6.0 L of an ideal gas in a flexible container is decreased to one-eighth of its original pressure, and its absolute temperature is decreased to one-seventh of the original. What is the final volume of the gas?
September 20, 2010

ECONOMICS
qs=-400+2p qd=1600-2p how do i graph that
September 20, 2010

Physics
First you need to solve for time by using d=(1/2)(a)(t^2)+(vi)t 1m=(1/2)(9.8)t^2 vertical initial velocity is 0m/s t=.45 sec Then you find the horizontal distance traveled by using v=d/t 1.3m/s=d/.54sec d=.585m Then you need to find the time of player B by using d=(1/2)(a)(t^2...
September 20, 2010

calc 3
Find the limit ( e^-3t i + tsin(1/t)j + arctan tk ) if it exists. If not say doesn’t exsist. (t→ ∞)
September 20, 2010

Math 117
length = x width = x-l area = length*width 12 = (x)*(x-1) solve for x... use the equations above to get the length and width..
September 19, 2010

calculus
f(x)=kx^2+3 a) if the tangent lines to the graph of f at (t,f(t)) and (-t, f(-t)) are perpendicular, find t in terms of k b) Find the coordinate of the point of intersection of the tangent lines mentioned in part (a) in terms of k
September 19, 2010

Science
A passenger in a moving train drops an apple. Describe how a man standing by the train tracks sees the apple falling when he looks through the window.
September 18, 2010

math 115
f(-4)=4-2(-4) f(-4)=4+8 f(-4)=12 you must be bored of me by now..haha!
September 16, 2010

math/115
you're welcome again.. =)
September 16, 2010

math/115
solve the second one by substituting x with -3...
September 16, 2010

math/115
substitute the x with 3 for the first question.. you'll get f(3)=2(3)-14 f(3)=6-14 f(3)=-8
September 16, 2010

math 115
you're welcome!
September 16, 2010

math 115
when x=5, substitute all the x's with 5.. do the same when x=-5
September 16, 2010

math 115
h(5)=19-5 h(-5)=19+5
September 16, 2010

math
(3x)(10-5)=(x)(5-x) 30x-15x=5x-x^2 divide the whole equation by x 30-15=5-x solve for x
September 16, 2010

11th grade
you're welcome!
September 16, 2010

11th grade
for example in #1. 2x-1=y if y=0; 2x-1=0 then x=1/2 if x=0; 2(0)-1=y then y=-1 on the graph plot the points (1/2,0) and (0,-1) draw a line containing those points..
September 16, 2010

11th grade
does it help?? :)
September 16, 2010

11th grade
each of those functions form a line.. for each function, solve the value of x when y=0. solve the value of y when x=0.. plot the two points in the graph then connect them to form a line...
September 16, 2010

11th grade
are you supposed to graph those functions?
September 16, 2010

11th grade
what is the question?
September 16, 2010

math
so what's the question?
September 16, 2010

algebra
x+1/2=1 | x+1/2=-1 x=1-1/2 | x=-1-1/2 x=1/2 | x=-3/2
September 16, 2010

Math
sorry again! 100=4(x)+2(40-x) is the right one..
September 16, 2010

Math
sorry!!! cows=x chickens=40-x 100=2(x)+4(40-x)
September 16, 2010

Math
chickens = 40/2 cows = 100/4
September 16, 2010

Math
number of cars skywalks = x toyotas = 2x pintos = 2x-8 grand arms = 4(2x-8) = 24 solve for the x using the grand arms equation above... substitute x to the equations to get the number of cars per type of car.. add all the cars from each type..
September 16, 2010

math
solve for x and then find out how much each person gets using by substituting x to the values..
September 16, 2010

math
sorry! theres a modification: the 2 grandchildren each gets x dollars. son gets 2(2x) dollars widow gets 2(2x)+2000+2x dollars all add up to $62000
September 16, 2010

math
the 2 grandchildren each gets x dollars. son gets 2(2x) dollars widow gets 2(2x)+2000 dollars all add up to $62000
September 16, 2010

Math
if either a or b is equal to 0, (a+b)^2 and a^2 + b^2 will have the same values.
September 16, 2010

Math
0 (a+b)^2=a^2+b^2 a^2+2ab+b^2=a^2+b^2 2ab=0 then: a=0 and b=0
September 16, 2010

Math
find the LCM
September 16, 2010

Geometry
welcome.. =]
September 16, 2010

Geometry
the first line should be "5x+9=3x-33"
September 16, 2010

Geometry
5x+9=3x=33 5x-3x=33-9 2x=24 x=12 BK=2(5(12)+9) =138
September 16, 2010

statistics
In a survey of 5100 TV viewers, 40% said they watch network news programs. Find the margin of error for this survey if we want 95% confidence in our estimate of the percent of TV viewers who watch network news programs. Hint, find the CI using 1-PropZInt, then add and subtract...
September 13, 2010

Finance
a. 7.11% b. N = 10, PV = -985, PMT = 70, FV = 1000 YTM = 7.2157% = 7.22% c. N = 7, I/YR = 7.2157, PMT = 70, FV = 1000 PV = $988.46
September 9, 2010

Science - Physics
How long would it take you to drive from Houston to Gatorville LA (235 miles0 if you drive the first 75 miles at 60 mph, the next 100 miles at 65 mph, and the last 60 miles at 70 mph? What is your average speed for the entire trip?
September 6, 2010

algebra
(2t+3)11
August 25, 2010

Environmental health
Is it true or false that risk to a population group is generally expressed as the likelihood of an event happening?
August 21, 2010

com156
How does prewriting affect the success of an essay
August 18, 2010

algebra
The Big Screamer Coaster carries 92 people altogether. Some of its cars carry 4 passengers, and the rest carry 6 passengers. There are three less 6-passenger cars than 4-passenger cars. How many 4-passenger cars are there?
August 10, 2010

AP Biology
Yes, but none satisfy the problem.
August 1, 2010

AP Biology
What is not dependent on sunlight as a source of energy? A. Benthic Zone B. Pelagic Zone C. Neritic Zone D. Taiga E. Tundra Please answer A.S.A.P.
August 1, 2010

AP Biology
I think it is between A or B.
August 1, 2010

AP Biology
The type of learning that is involved in predator/prey interactions where an alteration in behavior is a response to stimulus is called? A. Habituation Learning B. Cognitive Learning C. Instinctive Learning D. Associative Learning E. Non-associative Learning Please, answer A....
August 1, 2010

Math
how do you calculate the fomula for a pyramid?
July 13, 2010

His/135
How do I describe the social, economic, and political composition of te decade of corporate greed and how it affected the political climate of the 1980s?
June 9, 2010

Thanks!
:)
June 8, 2010

Math
Describe each set of points for the given mathematical statement. (x + 3)^2 + (y - 4)^2 = 9 How would I figure this out? Any help would be great, thanks! :)
June 8, 2010

english
Can anyone tell me the tone of this poem? THE INVADING SPRING - Phoebe Hesketh Man has fenced the wilderness back in the hills; Tamed in the town he walks on concrete blocks; And in the park his heart with pleasure fills - But not at Wordsworth’s school-book daffodils. No...
June 6, 2010

Science
Okay, I get that. But I don't know where I would find these answers. Which is why I'm here asking you because honestly, I don't know them at all!
May 26, 2010

Science
These are all fill in the blank questions. Most objects _____ some colors or wavelengths of light and ____ others. When you paint a picture in art class the color is produced by color _____. Color was assed by hand called ____. __________ developed the making of metal letters ...
May 26, 2010

Science
We see a specific color, like yellow, because only yellow ____ are bounced back to your eyes.
May 26, 2010

science
s it possible for seismologist to know for sure that an earthquake or volcanic eruption will not occur in a particular area? And why
May 25, 2010

Physics
What causes the restoring force in a simple pendulum? A. friction between the thread and the support B. the force exerted on the pendulum bob while displacing it from the mean position C. the component of the weight of the bob acting perpendicular to the thread D. the ...
May 25, 2010

algebra
How do you solve this math problem? h= -8t^2+40t then it says: when t=0 and when t= 5 there are 2 questions that i have to answer: 1.) find the value of h 2.) graph this equation - i dont know if i did the problem right but when i answered #1 i got h=0, - and when i answered #...
May 21, 2010

physics
The energy difference between states A and B is twice the energy difference between states B and C (C > B > A). In a transition (quantum jump) from C to B, an electron emits a photon of wavelength 600 nm.
May 18, 2010

space
Which planet number are we?
May 17, 2010

Math
How do you solve an Expression?
May 17, 2010

Physics (math)
Fayce Slift found that it took her 132 steps to pace off 100.0 m. She was studying the flying trapeze. She noticed that when the ride was running that the chairs swung outward. She found that it took her 14.5 steps to go from the outside of the swing path on one side to the ...
May 9, 2010

distillation
what is the purpose of adding packing material to the distillation column? what is the purpose of insulating the distillation column?
May 6, 2010

Chemistry
Calculate the pH of a buffered solution that is 0.100M in C6H5COOH (benzoic acid, Ka = 6.4 x 10-5) and 0.100M in sodium benzoate (NaC6H5COO).
May 5, 2010

Chemistry
How many mL of 0.75M HCl are needed to neutralize 20.0 grams of NaOH?
April 29, 2010

Chemistry
How many mL of 0.75M HCl are needed to neutralize 20.0 grams of NaOH?
April 29, 2010

english
how does anna feel about what is happening to her family from the play Thunder on Sycamore Street
April 26, 2010

Science
I'm trying to determine what fossil fuel contributes the most to acid rain. I said coal because it is thought to be the "dirtiest" fuel with the greatest carbon footprint. Do you think this is correct?
April 26, 2010

Question about University (general).
Hello! I'm just trying to get an understanding of the reputations of some of the fine post-secondary institutions in Canada. I know this is not a homework question, and that all of the educators on this site are busy helping with homework questions. But, considering most ...
April 23, 2010

math
Soybean Meal Is 16% Protein; Cornmeal Is 8% Protein. How Many Pound Of Each Should Be Mixed Together In Order To Get 320 Lb. Mixture That Is 15% Protein?
April 23, 2010

english
it is B.
April 20, 2010

ochem
What's an equation of the hydrolysis of one ester group in tannins by CaCO3?
April 16, 2010

chemistry
how would longer roasting time of green coffee beans effect its caffeine content? why?
April 14, 2010

11th grade chemistry
How many grams are in 2.7 mol of table salt, NaCl (molar mass of NaCl=58.44 g/mol)?
April 13, 2010

trig
The function d=-8cos2t describes a simple harmonic motion, where d is the distance(in meters) an object travel in t seconds. What is the frequency?
April 13, 2010

trigonometry
The function d=11cos6t describes a simple harmonic motion, where d is the distance(in meters) an object travels in t seconds. What is the time required for one complete cycle?
April 13, 2010

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