Saturday
May 30, 2015

Posts by Ana


Total # Posts: 1,063

Stats
Angela is conducting a poll on campus to determine the next student representative. How many students does she need to sample for a confidence level of 90% with a margin of error of + or - 5%?
May 14, 2011

math
how 2 write 7th may 2011 in 5letters without using numberss
May 7, 2011

College Chemistry
can someone please explain how to indicate where a label appears in a product? for example: where the label appears in 2-[14C]-Glycine --> AMP
May 2, 2011

lenguage art
howw would you define the speaker's love for annabel lee ?would you want to feel or be the object of such a love ? explain why or why not.
May 1, 2011

physics
Choose the correct description for each "Law" of Electricity & Magnetism. The choices are faradays law lenz law ampere law are my choices correct Gives the amount of current resulting from a changing magnetic field.AMPERE LAW Gives the strength of the magnetic field ...
May 1, 2011

Trading Posts
OMG justin bieber is DYing yeah fanilly he diying no one like jb anymore.
April 30, 2011

Trading Posts
just kidding, i don't know the queen. but i do need help asap.kkk thanks
April 30, 2011

Trading Posts
the queen is my grandma.....of canada this is kate middleton
April 30, 2011

Trading Posts
what were the effects of having to use rivers to complete such long journeys?I really need a good answer by monday can some one plese answer this question for em please come on anyone i know the are smarts people out there in the world...yes no whatever come on some one has to...
April 30, 2011

Geometry
Find the measure of each angle (x + 1) (4x - 56)
April 25, 2011

physics
Two wires run parallel to each other with currents I1 = -60.3 A, and I2 = 44.1 A. If they are a = 0.12 m apart, what is the magnitude of the force (N) per meter of length? I used the formula (f/L)=Uo(I1)(I2)/(2(pi)(r)) I got 4.43810^-2(N/m)but it was wrong..I'm not sure ...
April 24, 2011

math
a draw holds 5 navy socks, 7 white socks and 6 black socks. if two socks are selected at random without looking what is the probability that they do no match?
April 21, 2011

Calculus2
Please, help me I really need help on this problem. Thank you so much for all your help. Question: Find the radius of convergence and interval of convergence for sum(n=1to infinity)(-1)^n-1 multiply by n(x-1)^n/(n^2+1)2^n Thank you again
April 21, 2011

Calculus2
Please, help me I really need help on this problem. Thank you so much for all your help. Question: Find the radius of convergence and interval of convergence for sum(n=1to infinity)(-1)^n-1 n(x-1)^n/(n^2+1)2^n Thank you again
April 21, 2011

social studies
How does the far north of the region differ from the rest of the region?
April 5, 2011

Word Meaning
unjust
April 3, 2011

math polynomials
both are right!
April 3, 2011

chemistry
Write equations for any net reacts in the cases above; then, based on these observations, arrange each of the substances AgCl, AgI, Ag2O, and Ag(NH3)2 + in such an order that their solutions with water would give a successively decreasing concentration of Ag+.
April 2, 2011

chemistry
suppose you are given the following experimentally observed facts regarding the reactions of silver ion. (a) Ag+ reacts w/ Cl- to give white AgCl (s) (b) Ag+ reacts with ammonia to give a quite stable complex ion, Ag(NH3)2+ (c) a black suspension of solid silver oxide, Ag2O(s...
April 2, 2011

chemistry
thank you!
April 2, 2011

chemistry
calculate the OH- concentration in (a) 1.0M NH3 and (b) a solution that is 1.0M in NH3 and also 1.0M in NH4Cl. (Kb = 1.8 x 10^-5 for NH3)
April 2, 2011

chemistry
thanks!
April 2, 2011

chemistry
when ammonia is added to Zn(NO3)2 solution, a white precipitate forms, which dissolves on the addition of excess ammonia. But when ammonia is added to a mixture of Zn(NO3)2 and NH4NO3, no precipitate forms at any time. Suggest an explanation for this difference in behaviour.
April 2, 2011

Algebra 2
i actually have two questions. - the edge of one cube is 4 m shorter than the edge of a second cube. the volumes of the two cubes differ by 1216m^3. find the edge of the smaller cube. - the sum of the squares of the two larger of three consecutive even integers is 12 less than...
March 20, 2011

Math Algebra 2
A rectangular garden is fenced on three sides with a wall forming the fourth side. the total length of the fence is 70m. the area if the garden is 600m^2. find the dimensions of the garden.
March 20, 2011

algebra (parabolas)
to find the axis of symmetry you must use the formula x=-b/2a which in (1. a=1 b=0 c=9) 1.x=-b/2a = o/1(2) 0/2 =0 your axis of symmetry would be 0 and to find out if it goes upward or downward you must plug in more numbers to get more cordinates
March 20, 2011

Algebra 2
The question says to make a statement about Log A over B & Log B over A & prove it. How do I answer?
March 15, 2011

algebra
A man wants to build a rectangular pen in which to keep his dog. If he uses one side of his barn, what is the maximum area that he can enclose with 80 meter of fencing?
March 15, 2011

Calculus
Find the slope of the tangent to the curve y^2=x^3/(xy+6) at (6,3)
March 15, 2011

Math
I have not learned that way yet I am in 3rd grade we just started mixed numbers
March 9, 2011

Math
which mixed number is greatest? 1 1/2 1 1/3 1 1/4 1 2/3
March 9, 2011

Physics
n an auto accident, a car hit a pedestrian and the driver then slammed on the brakes to stop the car. During the subsequent trial, the driver's lawyer claimed that the driver was obeying the posted 35.0 mph speed limit, but that the limit was too high to enable him to see ...
March 8, 2011

Physics
At 7.65 cents per kilowatt-hour, what does it cost to operate a 10.0 hp motor for 6.00 hr? At 7.65 cents per kilowatt-hour, what does it cost to leave a 75.0 W light burning 24.0 hours a day?
March 6, 2011

physics
Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes each cart with the same force for 6.00 s. If the kinetic energy of the lighter cart after the push is K, the kinetic energy of the heavier cart is A. 1/4 K B. 1/2 K C. K...
March 6, 2011

physics
Two carts, one twice as heavy as the other, are at rest on a horizontal frictionless track. A person pushes each cart with the same force for 4.00 s. If the magnitude of the momentum of the lighter cart after the push is P, the magnitude of the momentum of the heavier cart is ...
March 6, 2011

physics
To stretch a certain spring by 2.00 cm from its equilibrium position requires 9.50 J of work. a. What is the force constant of this spring? b. What was the maximum force required to stretch it by that distance?
March 6, 2011

Physics
A heavy rifle initially at rest fires a light bullet. Which of the following statements about these objects is true? A. The bullet and rifle both gain the same magnitude of momentum. B. The bullet and rifle are both acted upon by the same average force during the firing. C. ...
March 6, 2011

Physics
Cart A, of mass 3.00 kg, approaches and collides with cart B, which has a mass of 7.00 kg and is initially at rest. When the springs have reached their maximum compression, a. cart A has come to rest relative to the ground. b. both carts have the same velocity. c. both carts ...
March 6, 2011

Chemistry
What unit is barometric pressure measured in?
February 27, 2011

social studies
I need 3 facts about the code of Chivalry
February 23, 2011

math
penny has 25 dimes. she likes to arrange them into three piles, putting an odd number of dimes into each pile. in how many ways could she do this?
February 14, 2011

physics
Never mind I figured it out:)
February 13, 2011

physics
A positive charge of 4.10 C is fixed in place. From a distance of 3.70 cm a particle of mass 6.80 g and charge +3.60 C is fired with an initial speed of 80.0 m/s directly toward the fixed charge. How close to the fixed charge does the particle get before it comes to rest and ...
February 13, 2011

Pre-Calculus
How do I make a table for f(x)= [[x-1]] ? It's a greatest integer function..
February 13, 2011

physics
A positive charge of 5.10 C is fixed in place. From a distance of 3.70 cm a particle of mass 6.80 g and charge +2.60 C is fired with an initial speed of 70.0 m/s directly toward the fixed charge. How close to the fixed charge does the particle get before it comes to rest and ...
February 13, 2011

AP Chemistry
I have no idea how to answer this question: A compound effuses through a porous cylinder 3.20 time faster than helium. What is it’s molar mass? Help me please? Give a step by step detail please.
February 10, 2011

marketing assignments
I've done my assignment but i've not done the citations. can u help me
February 4, 2011

chemistry
How many grams of sodium chloride are needed to prepare a 0.400m NaCl solution that contains 750g of water?
February 3, 2011

math
Sketch an area model for each exercise then find the product. 74x92
February 2, 2011

Spelling
Man woman curved
February 1, 2011

physics
A flat horizontal surface with an area of 650 cm2 is inside a uniform electric field of 2.99×104 N/C. The angle between the area vector and the electric field is 14.8°. What is the electric flux through the surface?
January 30, 2011

Math
A walks 2Km south to B, she the walks 3km west to C. Find the distance and bearing from C and A
January 25, 2011

math
Convert the base-ten number to a numeral in the indicated base. 40 to base two
January 24, 2011

Chemistry
What is the mathematical relationship between pressure and temperature?
January 20, 2011

alg.2
solve by elimination x+3y=0 2x+6y=5
January 19, 2011

ChemII
450 grams
January 9, 2011

geometry
ABCD is a parallelogram. solve for x and find the lengths of BC=16+2x and AD=10+8x
January 4, 2011

AP Chemistry
(pure CH3COOH) Ka = 1.8 x 10-5 sodium acetate NaCH3COO CH3COOH --> CH3COO + H Ka= [H+][CH3COO-]/[CH3COOH] = 1.8 x10^-5 [H+]= 4.85 pH = pKa + log [base]/[acid] 5.0 (chosen pH of buffer) = 4.85 + log [base]/[acid] .15 = log [base]/[acid] 10^0.15 = [1.41 M]/[1 M]
January 3, 2011

AP Chemistry
We're doing a lab in my class and we're supposed to make a buffer at a certain pH. I have decided to make a buffer with a pH of 5.0 using glacial acetic acid (pure CH3COOH) and sodium acetate. I found that the ratio of acid to base is 1.41 M: 1.0 M and now I'm ...
January 3, 2011

math
The discriminant of a quadratic equation is 35. The roots are: a) unequal rational numbers b) unequal irrational numbers c) equal rational numbers d) imaginary numbers Please explain.
December 27, 2010

Algebra
oops not done. (7/6 a) / 7/6 = (5/3 b + C)/ 7/6 a = (5/3 b + C)*(6/7) a = 10/7 b + 6/7 C
December 18, 2010

Algebra
C = 1/6 (10b-7a) C = (1/6*10b) - (1/6*7a) C = 5/3 b - 7/6 a +7/6 a +7/6 a C + 7/6 a = 5/3 b -C -C 7/6 a = 5/3 b + C
December 18, 2010

English
I'm trying to write a short story and there's an intense and mysterious scene that I'm writing. How do I make the scene more intense?
December 18, 2010

Math
Clara is placing the library books in counting order on the shelves. She has books numbered 849, 853, 774,and 836. How will she put them on the shelves.
December 15, 2010

biology
explain why mutations are almost always neutral or harmful
December 14, 2010

chemisty
600 mL of an unknown monoprotic acid was titrated with a standard solution of a 1.0 M base. If it took 40.0 mL of the base to neutralize the acid, what was the H+ ion concentration of the acid in moles per Liter?
December 14, 2010

Chemistry
Given a solution of ammonium chloride. What additional reagent or reagents are added to prepare a buffer from the ammonium chloride solution? I know the answer is NaOH but I don't know why. Can someone explain this to me please?
December 14, 2010

english
whats the crossing the threshold for shrek the mivie?
December 9, 2010

Teachers aide
music or words for four children's songs 2 must be from other cultures.must write song title, the name of the person who wrote it, the publisher's name and city and the copyright date. title: words by: music by: publisher,city,country: copyright date: please help!!!
December 8, 2010

Teachers aide
5 pamplets or copies that help parents understand how children grow and learn.
December 8, 2010

Math
What is the number of vertices of a triangular pyramid?
December 5, 2010

Math
Fill in the blank so that the given statement is true. The median is 77 65,68,78,82,89,__
December 5, 2010

Math
Fill in the blank so that the given statement is true. The median is 77 65,68,78,82,89,__
December 5, 2010

Math
<D=12 <G=118 ???
December 5, 2010

Math
<D is complentary to <E and <D is supplementary to <G If the measure of <E is 78 find the measure of <D and <G
December 5, 2010

Mathh
<D is complentary to <E and <D is supplementary to <G If the measure of <E is 78 find the measure of <D and <G
December 5, 2010

Chemistry
Thanks so much. Especially for the ion list link. :)
November 28, 2010

Chemistry
How do I figure out what ions are present in a compound? Is it as simple as separating the compound? Like HCl --> H+, Cl-
November 28, 2010

Chemistry
So I mixed 25 mL of 0.002 M KSCN and 25 mL of water in a beaker. The solution was clear with no precipitants. But then it says the ions present in KSCN are: so i put K+,S2- , CN- is that right?
November 28, 2010

accounting
Alik Amal is a bar in Panama City, Florida. In April 2008, rowdy spring break guests damaged a jukebox that had been purchased in 1995 for $800. The jukebox had a useful life o1 ten years, with an estimated salvage value of $75. Alik AmaI decided to scrap the jukebox after the...
November 23, 2010

accounting
Glenmore Corp. purchased a fax machine at the beginning of 2007. The fmx machine cost s1,000 and is expected to last live years Its salvage value is expedted to be $50. It Glenmmore uses straight-line depreciabon, what will the fax mactiines net book value be at the end of 2008?
November 22, 2010

accounting
Adnan's Flower Shop provides floral arrangements for holidays and events. Adflans sold Oxford Cdy Hall a holiday arrangement for 10,000 on account in November Due to a government shutdown in December, Oxford only paid $1,500 otthe amount due within the prescribed period. ...
November 13, 2010

Chemistry
How do I predict whether the equilibrium lies to the right or left of an Acid-base equation? O[2-](aq) + H2O(l) <--> OH[-] + OH[-]
November 10, 2010

Chemistry
How do I predict whether the equilibrium lies to the right or left of an Acid-base equation?
November 9, 2010

budget and forecasting
19.0
October 31, 2010

English
I don't understand the concept of direct objects just yet. Okay, take the sentence, "Some reach a height of 120 feet." The comments above say it is transitional, but why? What is the direct verb?
October 28, 2010

math!!!!!!! help 3
that did not help me
October 27, 2010

Chemistry
What minimum number of moles of NH4Cl must be added to 1.0 liter of solution that is 0.10 M in Mg(NO3)2 and 1.0 M in NH3 to prevent precipitation of Mg(No3)2?
October 24, 2010

Chemistry
the energy from radiation can be used to cause the rupture of chemicals bonds. a minimum energy of 495 kj/mol is required to break the oxygen- oxygen bond in o2. what is the longest wavelength of radiation that possesses the necessary energy to break the bond?
October 24, 2010

Math
a=2a/(a-5) How do I work this out?
October 23, 2010

Chemistry
I don't understand this question and answer can someone help me? In order to exhibit delocalized pi bonding, a molecule must have . At least resonance 2 resonance structures. & In comparing the same two atoms bonded together, the greater the bond order, the shorter the ...
October 20, 2010

Chemistry
In comparing the same two atoms bonded together, the greater the bond order, the shorter the bond length, and the greater the bond energy. Why is this the case?
October 19, 2010

AP Chemistry
I don't understand this question and answer can someone help me? In order to exhibit delocalized pi bonding, a molecule must have . At least resonance 2 resonance structures.
October 19, 2010

english
I have to write a thoughtful composition on the following: Gothic novels emphasize horror, mystery, and the supernatural. Write an analysis of the gothic features of the nvel Frankenstein that are evident in Chapters 1 through 8. How does she Shelley establish an atmosphere of...
October 19, 2010

chemistry
Ok so im just totally confused because i dont technically have chemistry teacher (i have cancer so i cant go to school so while i have a teacher i can email questions to, he doesnt really help so im stuck teaching myself) & i didn't get any reference to make i sure i got ...
October 9, 2010

math
The following table gives the cost and revenue, in dollars, for different production levels, q. Answer the questions below. q 0 100 200 300 400 500 600 R(q) 0 450 900 1350 1800 2250 2700 C(q) 670 865 990 1095 1255 1820 2590 1. The fixed costs are dollars 2. The price charged ...
October 8, 2010

math
At a production level of 1400 items, the total cost is $7250 and the marginal cost is $25. Use this information to estimate the costs of producing the following number of items. Your answers should be whole numbers. a) 1401 items . b) 1399 items . c) 1450 items .
October 8, 2010

algebra
this is probablt really simple, but for some reason I can't find out how to do it... solve for b; 2a/bc= 12 (show your work)
October 8, 2010

AP Chemistry
I don't understand that, can you explain it more fully?
October 6, 2010

AP Chemistry
for BF3 and CH4
October 6, 2010

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