Questions Asked on
May 6, 2007

Titration/Acidbase chem
a .4000 M solution of nitric acid is used to titrate 50.00 mL of .237 M barium hydroxide (Assume that volumes are additive). a) Write a balanced net ionic equation for the reaction that takes place during titration. b) what are the species present at the
asked by Keith 
MATH!
To get from his high school to his home, Jamal travels 5.0 miles east and then 4.0 miles north. When Shelia goes to her home from the same high school she travels 8.0 miles east and 2.0 miles south. What is the measure of the shortest distance, to the
asked by megan 
Chemistry
What is the solubility of silver chloride in water at 25C? (Ksp = 1.6 x 10^10) I don't know how to do the work AgCl(s) ==> Ag^+ + Cl^ Let x = molar solutility of AgCl. Then x = molar concentration of Ag^+. and x = molar concentraton of Cl^ Then Ksp =
asked by Chem girl 
Math
Keiko has 7 colors of lanyard. She uses 3 different colors to make a keychain. How many different combinations can she choose? 7 for the first, 6 for the second and 5 for the third. The answer is the product of those numbers, no matter what order the three
asked by Allison 
WHY?
WHy are my questions being deleted? plz help me..i didn't mean to be rude :( Repost please. Please post under just one name. Posting several questions under differing names (Julia, Steph, etc) is not conductive to a healthy relationship to those
asked by URGENT PLZ 
Chemistry
What is the solubility of lead bromide at 25C? (Ksp = 4.6 x E^6) You have used another name here but work the problem the same way I showed you for AgCl. The only difference is that PbBr2(s) ==> Pb^+2 + 2Br^ Post your work if you get stuck.
asked by Chem HELP 
MATH.
Radio station KMA is increasing its radio listening radius from 40 miles to 50 miles. How many additional square miles of listening area, to the nearest tenth, will the radio station gain? I thought it was 10 miles.But it says round.So im a little
asked by megan 
calc
derivative of (x^3/6)+(1/2x)? i got (x^2/2)(1/2x^2) is that correct? and then wut is the (F'(x))2?...meaning the derivative squred? if you meant (1/2)x^2  1/(2x^2) you are correct I don't think they are looking for the square of the derivative, but
asked by MARY 
Precalc
prove the identity: (cosx)(tanx + sinx cotx)=sinx+cos(squared)x i need steps to show how i got the answer generally, it is a good idea to change all trig ratios to sines and cosines, and start with the more complicatedlooking side. so.... LS =
asked by Stacey 
calculus
what is the antiderivative on square root of cosh^2(x)? The square root of cosh^2 x is just cosh x, and the integral (or "antiderivative", if you prefer thet term) of that is sinh x.
asked by HELP PLZ 
Science
Give examples of parasitism, mutualism and commensalism.
asked by Emma 
Calculus
Find the inverse of each relation: y = (0.5)^(x+2) and y = 3log base 2 (x3) + 2 For the first one I got y=log base 0.5 (x+2)...but the answer in the back of the textbook says that it is not x+2, but x2. Can someone tell me why it would end up being x2
asked by Raj 
Chemistry
"Solid dinitrogen pentoxide is added to water." I got this as my answer: N2O5 + H20 > 2HNO3. Do I need to break 2HNO3 apart since it's a strong acid? I thought it wouldn't since I thought it was a synthesis problem. I read online that this was the answer
asked by Rachael 
economics
If the reserve requirement is 20% and a bank doesn't have excess reserves, why would a $100 deposit lead to a greater than $100 increase in the money supply. answer posted above.
asked by Carter 
econ.
If the reserve requirement is 20% and a bank doesn't have excess reserves, why would a $100 deposit lead to a greater than $100 increase in the money supply. because of the money multiplier. A $100 deposit (e.g., into a checking account) gives the bank
asked by Carter 
math
HELP. Help I have to decide whether these are rational or irrational. .73737373... .61611611161111..... 1/23 Can someone explain this to me? Rational numbers are just fractions. The decimal expansion of fractions will either terminate or it will become
asked by Kimberly 
Calculus
Express in exponential form: y = log x with base 2 the  in front is like a 1 multiplied so write it as y = log2 x1 then 2y = 1/x
asked by Raj 
English
im an only child and parents are too busy to help so, i need to interview someone that went to school 20 years ago and i was wondering if anyone would like to help me. Theses are my 7 questions because i already have 3 answered: 1.How was school like back
asked by ron 
Diorama
I just thought that there are people always on this web 2 help. Now I know. ** Lily, yes I am a teacher, and so are a number of others who help here. We are happy to help, but are not always here at the exact moment you are. Good luck with your project.
asked by Lily 
finance
There should be some websites in here to help you: http://www.google.com/search?q=payroll+tax+formulas+WI&rls=com.microsoft:enus:IESearchBox&ie=UTF8&oe=UTF8&sourceid=ie7&rlz=1I7SUNA =) project is to calculate payroll. I have the gross earnings, what
asked by Writeacher 
Science
Postive charges move when they are attracted to negatives, or when they are repelled by another positive. in What Situations can positive charges move? Put 2 magnets 2gether. Or u can look @ ur science textbook or w/e. lalalalalalalalalala. That's my name!
asked by bobpursley 
Algebra
Can someone show me step by step how to do this problem to have an example to go by so I will be able to do my other problems. Thanks Solve by substitution 4x12y=5 x+3y=1 I know that you have solve one of the equations. I have picked the second one so
asked by jessica 
Chem
What mass of nickel is dissolved in 100. mL of saturated nickel (II) hydroxide? (Ksp = 1.6 X 10^16) How do I do this? Please don't use different names. It helps us to know what we have already told you in other problems if we have some consistency with
asked by HELP ME 
trig help
I need help finding sinA if cosA=(3/5) and A is greater than 90 degrees, but less than 180 degrees. Draw the quadrant diagram. In the upper left quadrant, greater then ninety degrees, but less than 180, cosine is neg, and sine is positive. Draw a three,
asked by Cory 
maths
The head of an industrial machine moves in a straight line horizontally backwards and forwards from a central position. The movement can be modelled using the sine wave d = 80 sin ( pie t), where d is the horizontal distance (in cm) from the central
asked by k 
economics
If the reserve requirement is 20% and a bank doesn't have excess reserves, why would a $100 deposit lead to a greater than $100 increase in the money supply? Interest?
asked by Carter 
Physics, please help!!!!
A 3.00 kHz tone is being produced by a speaker with a diameter of 0.175 m. The air temperature changes from 0 to 29°C. Assuming air to be an ideal gas, find the change in the diffraction angle My solution v directly proportional to sqrt T v = sqrt 302
asked by Papito 
CALC
I am sorry i still don't know how to start. and i am sorry for the problem earlier..it wasn't my fault :( Note that the way students like you are asked to solve this and similar problems is usually not the way people like me solve such problems. It is a
asked by URGENT PLZ 
physics
I have to build a mini solar car for a school project and i have three solar cells that i bought. whenever i hook up the solar cells i get a reading between 1.51.8 volts, but when i hook it up to the motor it wont start it. According to the box the motor
asked by Matt 
Calculus
yes! tnk u ok? It's actually (x>0.) Find the limit of cot(x)csc(x) as x approached 0? Lim [cot(x)  csc (x)] ..x>0 = Lim [(cos x 1)/sin x] ..x>0 Use L'Hopital's rule and take the ratio of the derivatives: Lim (sin x/cos x) = 0 x>0 thank you very
asked by Maria 
chem equations
could someone tell me how i could solve this chem equation CH4 + NH3 +O2...> HCN +H20 AND USE THE LOWEST WHOLE NUMBER COEFFICIENT i WOULD BE GRATEFUL FOR ANY POINTERS Try these coefficients. 2,2,3==>2,6 Hi bex heres a little more help for you. Answer is
asked by bex 
physics
can anyone plz explain to me what is the electrical nature of water molecules????i look through many information on the websites...i just don't get what they are talking about...PLZ HELP!!THX A LOT!!! The water molecule is the shape of a V. The the oxygen
asked by koeit 
science
I have several questions regarding essential oils. Please answer as many questions as you can that is within your expertise. For each of the following naturally occurring oils: Citronella ,eucalyptus,cinnamon leaf,nutmeg,clove,rose,jasmine,lavender a.how
asked by khairul 
Math
This problem is really confusing, I have been trying and I can't get the answer, can you help me? An Afternoon event was a race through the park. The race started at the point with the coordinates of (2,3). The first turn was at (2,6), the second turn was
asked by Robert 
health
This isn't a school question, this is for my own understanding. I'm thinking about majoring in it. What is the difference between a respiratory care person and a respiratory therapist? I think they are the same. And could someone tell me what goes into the
asked by jake 
PreCalc
Hi, I need help writing log(x^29)log(x^2+7x+12) as a single logarithm. Thankyou! since there is a subtraction sign in between that means you divide the two terms...so it would be log(x^29/x^2+7x+12) you can go further and factor the two...so by
asked by Ashley 
CALCULUS
what is the derivative of ln(x1)? If you are studying the calculus of logarithms your question surprises me, since that is one of the most basic ones in that topic. in general if y = ln("anything") then y' = 1/"anything" * derivative of "anything" just
asked by URGENT 
I am lost
Simplify this expression x ^2  64 / x + 8 _______ ______ x ^2 25 / x  5 Please note that we don't do students' homework for them. Our tutors try to give you the information to help you complete your assignment on your own. If there's not a tutor with
asked by James 
calculusintegration!
should i use substitution?? if yes how should should i use it? plz i need some directions? k plz someone?...so far i used trig. substitution. i got a=8, so i used x=asin(è)so according to this substitution i got x=8sin(è) and dx=8cos(è) dè...then i
asked by Maria 
physics
we put 2 mirrors perpendicular to each other and then an object in front. the result is 3 images of that object. how does the middle image occur? The middle image appears directly behind the intersection of the two mirrors, and is a doublereflection off
asked by JJ 
calculus
Find the solution to the differential equation dy/dx = (x^3)/(y^2), where y(2) = 3 I have: The integral of: dy(y^2) = the integral of: dx(x^3) (y^3)/3 = (x^4)/4 The answer is supposed to come out to be y= the cube root of: ( 3/4x + 15 ) Thanks The general
asked by Suzie 
Economics
Suppose that you are a policy maker concerned with correcting the effects of gases and particulates emitted by an local power plant. 1. What tools would you use? 2. What would be the benefits of the actions? 3. What would be the costs? 4. How would you
asked by Jo 
math
I do not undeerstand this question for homework. Determine if the set is closed for the given operation. 1. yes or no The set of positive fractions for division. 2. yes or no=The set of positive integers for subtraction. Can someone help me? Is there a
asked by Kimberly 
ap nsl [test tomorrow!]
what is a legistlative veto. Here are several good answers: http://www.google.com/search?q=legislative+veto&rls=com.microsoft:enus:IESearchBox&ie=UTF8&oe=UTF8&sourceid=ie7&rlz=1I7SUNA =)
asked by serts 
life science
name the three enviormental factors in order for an organism to live. temperature, nutrients. Nutrients include oxygen, nitrogen, carbon dioxide and other gases if needed. Some organisms use ammonia as a nutrient. Since this is not my area of expertise, I
asked by Emily 
Cos(pi/4 + h) = 2^(½)[1  h  h^2/2 + h^3/6 +..]
This reply to some student got deleted, so I'm reposting it. Cos(pi/4 + h) = Cos(pi/4)Cos(h)  Sin(pi/4)Sin(h) = 1/sqrt(2)[1  h  h^2/2 + h^3/6 + h^4/24  h^5/120  h^6/720 + ...] Note that the way students like you are asked to solve this and similar
asked by Count Iblis 
science
how do jupiter's moons stay in orbit around jupiter? Gravity.
asked by s 
math
I do not undeerstand this question for homework. Determine if the set is closed for the given operation. 1. yes or no The set of positive fractions for division. 2. yes or no=The set of positive integers for subtraction. Can someone help me?
asked by tayloir 
some algebra help (radicals)
I hope I am writing this down right.. I am trying to do some practice questions to learn 10^5 (sqrt)2y  4^5 (sqrt)2y I am trying to figure out how to solve this They gave us some answers to choose from, but I am clueless on how to solve this 6y ^5 (sqrt)2
asked by Cassie 
TO ALL STUDENTS
If you are able to help another student with his/her homework, please do. But if you cannot, please don't post anything. If a teacher sees a post has been answered, he or she might think the original student doesn't need help anymore. Thanks. =)
asked by Writeacher 
Table of Contents
I seem silly asking this question but.... How does a table of contents look like? I forgot. Thank you for using the Jiskha Homework Help Forum. The Table of Contents in ANY book that you are familiar with, will give you an idea of the format. Also, here is
asked by Lily 
science
the first word of an organisms scientific name http://en.wikipedia.org/wiki/Binomial_nomenclature
asked by jean 
chemistry
a solution in which no more solid can be dissolved is referred to as ???? Saturated?
asked by emi 
Algebra help needed!
x ^2 + 6x + 9 (x ^2  3x) _____________ __________ x (x ^2  9) possible answers are 1 ___ x 3 x3 x + 3 1 ____ x + 3 so far i got 3x(3X4)/X^39....then facotor the denominator...after that cancel out the like terms.. Simplify I am using parenthesis to
asked by Heidi 
math
I have write the number to a fraction. 1/8. Would it be .08% or 12.5 % 12.5%
asked by priscilla 
Social Studies
What's a web for help with Ancient Egyptians' mummification process? Here are a couple of sites that will be of help. http://www.touregypt.net/magazine/mummificationinancientegypt.htm http://www.egyptologyonline.com/mummification.htm Thanks so much. Thanks
asked by Lily 
Algebra help please
Simplify I am using parenthesis to separate , if i write the whole prob as is, it runs together a + 9 (3a  18) _____ ________ 36  a^2 (3a + 27) possible answers i can choose from 1 ____ a + 6 1 ____ a  6  1 ____ a  6  1 ___ a + 6 I am thinking it is
asked by Kitty 
English
In the first day of Killer Angels, (pages 168) what is the setting, and 3 conflicts. Also, I need to make up a spy name from the civil war Anonymous, we do not do your homework for you. When you have read the assignment and answered the question, then we
asked by Anonymous 
English
In the first day of Killer Angels, (pages 168) what is the setting, and 3 conflicts. Also, I need to make up a spy name from the civil war The conflicts need to be _____vs.________ So far i have: Setting; Gettsyburg, 1863 Conflicts: Union vs. Confederacy
asked by Anonymous 
maths
The head of an industrial machine moves in a straight line horizontally backwards and forwards from a central position. The movement can be modelled using the sine wave d = 80 sin ( pie t), where d is the horizontal distance (in cm) from the central
asked by k 
Math
How would you rewrite the equation y = 3x+1 as a function of x. Hmmm. It is written now as a function of x. Do you mean like this, where x is a function of y? x= 1/3 y 1 ? Could this be a trick question? I thought It was already a function of x? Thanks
asked by Erin 
Elem. Ed.
Can you please help with this question? Home visits,where a teacher visits children from her classroom and their parents in their homes,are valuable to all concerned. Which of the following is the greatest challenge to this form of parent involvement? 1.
asked by Jill 
CHEMISTRY
WOULD YOU PLEASE SAY ME WHATWE USE ETHANOL IN SENTHESIS OF CU(NH3)4SO4.H2O I'm not sure. You don't say what kind of ethyl alcohol nor how you synthesized the copper salt; however, an educated guess is that you used absolute alcohol (100%) to form the
asked by NAZANIN 
science
could someone please crique this algebra x must be the subject 6y = 9  3x 3x = 6y + 9 x = 2y + 3 is this correct please Add 3x to each side.Giving 6y+3x=9. Subtract 6y from each side.Giving 3x=96y. Divide each side by 3.Giving x=(96y)/3. Divide
asked by bex 
Physics and chemistry
why does the electrical resistance in your body decrease when you get wet Salt is in the skin, salt water is a good conductor.
asked by Jimmy 
science
blackbody radiation and cosmic microwave background This is hardly a question. http://en.wikipedia.org/wiki/Cosmic_microwave_background_radiation
asked by sonia 
Algebra
Given f(x) = 5x1, find f(a1). Would this be 5a+51? Yes, you have it. What grade are you in?
asked by Erin 
Personal FinanceMathe
Sue and Tom Wright are assistant professors at the local university. They each take home about $40,000 per year after taxes. Sue is 37 years of age, and Tom is 35. Their two children, Mike and Karen are 13 and 11. Were either one to die, they estimate that
asked by Jamie 
Simplify Completley
x/(6)+ 11x/6 2x
asked by margie 
Calculus HELP
for the power seies n^4x^n/2(n1)...find the radius and interval of convergence
asked by Steph