Friday
October 24, 2014

Posts by Rachel


Total # Posts: 1,208

math
not sure!
November 15, 2010

math
solve for x: 2xcubed+18x=-15xsquared
November 15, 2010

chemistry
For each of the following acid-base reactions, calculate how many grams of each acid are necessary to completely react with and neutralize 2.1g of the base. 1) HCl(aq)+NaOH(aq)-->H2O(l)+NaCl(aq) 2) 2HNO3(aq)+Ca(OH)2(aq)-->2H20(l)+Ca(NO3)2(aq) 3) H2SO4(aq)+2KOH(aq)-->...
November 11, 2010

chemistry
Determine the theoretical yield of C when each of the following amounts of A and B are allowed to react in the generic reaction: A+2B-->3C 1) 1mol A; 1 mole B 2) 1mole A; 3 mole B 3) 2mole A; 2 mole B 4) 32mole A; 68 mole B
November 10, 2010

chemistry
the value for the Ksp of silver chromate is reported to be 1.1 x 10^-12. in a saturated solution of silver chromate, the silver ion concentration is found to be 2.5 x 10^-4M. what must the chromate ion concentration be?
November 10, 2010

Geometry
A farmer uses 140 ft. of fencing to enclose a rectangular field. if the ratio of length to width is 3:4, find the diagonal of the field. Any help is appreciated, thank you!
November 7, 2010

French
Can you check these thanks. Le métro Directions: Completez 1. Il y a dix tickets de métr dans un ----------. Answer: carnet 2. On peut acheter des tickets au ----------- ou au -------------. Answer 1: guichet Answer 2: distribueur automatique 3. Les voyageurs ...
November 4, 2010

chem
How do I figure out the final Fe?
November 4, 2010

chem
A 455-g chunk of iron is removed from an oven and plunged into 385g water in an insulated container. The temperature of the water increases from 27 degrees celsius to 89 degrees celsius. If the specific heat of iron is 0.449 J g^-1 degrees Celsius^-1, what must have been the ...
November 4, 2010

chemistry
How many calories does it take to convert 22 grams of liquid water with a temperature of 48 degrees C to steam?
November 4, 2010

science
I mean Is 2Ag+S the same as Ag2S? The 2nd 2 is supposedly a subscript
November 2, 2010

science
Is 2Ag+S the same as Ag©üS?
November 2, 2010

Statistics
IQ test scores are normally distributed with a mean of 97 and a standard deviation of 11.An individual's IQ score is found to be 123.Find the z-score corresponding to this value
November 2, 2010

physics
thanks
October 28, 2010

physics
What force is required to accelerate a 90kg bike to 20 m/s in 15 sec? I need to know HOW to do it!
October 28, 2010

physics
What force is required to accelerate a 90kg bike to 20 m/s in 15 sec? I need to know HOW to do it!
October 28, 2010

global
if you are a greek individual living under ottoman rule, what would you say to persuade a European nation to help your cause ?
October 27, 2010

physics
A 625-kg racing car completes one lap in 14.3 s around a circular track with a radius of 55.0 m. The car moves at constant speed. (a) What is the acceleration of the car?
October 26, 2010

physics
Two force vectors F1 = (2.5 N) x - (3.0 N) y and F2 = - (6.0 N) x + (4.8 N) y are applied to a particle. What third force F3 would make the net, or resultant, force on the particle zero? Magnitude ___ N Direction ___° (from the +x axis)
October 26, 2010

physics
Two force vectors F1 = (2.5 N) x - (3.0 N) y and F2 = - (6.0 N) x + (4.8 N) y are applied to a particle. What third force F3 would make the net, or resultant, force on the particle zero? Magnitude ___ N Direction ___° (from the +x axis)
October 26, 2010

chemistry
write a net ionic equation for the following: 1)Iron (III) chloride reacts with Potassium hydroxide to produce Iron (III) oxide, Potassium chloride, and Hydrogen gas. 2)Hydrochloric acid reacts with Potassium carbonate to produce Potassium chloride, Hydrogen gas and Carbon ...
October 26, 2010

chemistry
write a net ionic equation for the following: Copper (II) sulfate reacts with Ammonium hydroxide to produce Copper (II) oxide, Ammonium sulfate, and water.
October 26, 2010

Phsyics
A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
October 26, 2010

Phsyics
A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
October 26, 2010

Phsyics
A bullet of mass 1.8 X 10-3 kg is moving at +500. m/s when it impacts a tree stump. It penetrates into the stump 6.00 centimeters before coming to rest. 1. Assuming the acceleration to be constant, calculate the force (including direction) exerted by the stump on the bullet.
October 26, 2010

chemistry
A pure copper cube has an edge length of 2.00cm. How many copper atoms does it contain? (volume of a cube = (edge length)^3; density of copper = 8.96g/cm^3 )
October 26, 2010

chemistry
thank you so much. you explain things really well!
October 26, 2010

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

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