Sunday
October 26, 2014

Posts by Kate


Total # Posts: 1,700

Algebra II
ok now this is an algebra 2 problem... I have goten far down to hear e^(ix) = (4i +/- 3)/5 now how do I solve for x I feel really stupid now as this is algebra 2... can't use natural log right or the common log as ln( e^(ix) ) does not equal ix so what do I do?
July 20, 2010

Calc
ok this is now an algebra question...
July 20, 2010

Calc
how do I solve this arcsin(4/5) note that I am not looking for about 53 degrees I believe I'm suppose to solve euler's formula for x i.e. sin (x) = (e^(ix) - e^(-ix))/(2i) where x is in radians hence I would do something like this sin (x) = (e^(ix) - e^(-ix))/(2i) = 4/...
July 20, 2010

Algebra 2
how do I find the length and width of a rectangle when the width of the rectangle is 3 feet less tahn the length. The area is 18ft^2
July 17, 2010

Jishka Staff
Oh is there another one or are there no more on here who teach biology besides that teacher?
July 13, 2010

Jishka Staff
Is you teacher who teaches AP Biology still sick last time I heard I was told he was to sick to even come on here is he back yet... i also am unsure of his name... thanks
July 13, 2010

college
let i = the square root of -1 with i to the 1st power =i, i to the 2nd power= -1, i to the 3rd power =-i , i to the 4th power=1 find ito the power 215
July 5, 2010

Biology/Math person please help
Will thanks for the help and ya native language is actually English... I just have a hard time making sense of what the college board is trying to say sometimes that is all lol... but ya can somebody who knows biology well and a little bit of math check this out please thanks...
July 4, 2010

Sorry
didn't know see your posts let me read them ignore these posts for the moment sorry :(
July 4, 2010

Biology (To SraJMcGin or anyone who can help)
Well I have found bits and pieces of that test online and found part of those questions on some power point that had 1986 next to it and the number of the question but no answers though...
July 4, 2010

Biology (To SraJMcGin or anyone who can help)
Ok can't right click copy paste scroll to the very top and you should be able to see the link and copy it into the adress bar with no spaces then press enter... The reason why I did that becasue the question was a couple of pages back and I cant post links If its easier ...
July 4, 2010

Biology (To SraJMcGin or anyone who can help)
h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 8 2 7 9 5 7 9 It's a webadress cant post links put it in your adress bar and delete the spaces then press enter. Thanks for the responses! By the way believe it or not those are actually from ...
July 4, 2010

Biology (Please Dont Skip Over)
h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 8 2 7 9 5 7 9
July 4, 2010

Biology
I think my questions were skipped over ignore this post if this is not so... h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 8 2 7 0 5 2 8 h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 8 2 6 9 0 4 4 please post ...
July 4, 2010

Biology
Questions 109-111 refer to the map below of the distribution of several populations on the continents of Eurasia and North America. These populations were derived from a common ancestral species. The area enclosed by a given dotted line represents the distribution of the ...
July 4, 2010

Biology
Iwas woudnering if you could help me with this problem. The answer key says that the answer is D and I have no idea why. The chart, included in the link, reads off a value of about .5 for the G locus for the year 1980 Finding the percent heterozygous should be as sipmle as 2(....
July 4, 2010

Chemistry
Ok apparently its just the mole ratio 2:1 from the coefficents so I just do 2(.507) to get my answer but how come I ignoered the coeficent of the Si in ther reaction?
July 3, 2010

Chemistry
Thanks for the help earlier My question Silicon tetrachloride (SiCl4) can be prepared by heating Si in chlorine gas: Si + 2Cl2 yields SiCl4 In one reaction 0.507 mole of SiCl4 is produced. How many moles of molecular chlorine were used in the reaction? Ok is it makeing ...
July 3, 2010

Chemistry
I know mathematically I can write chemical reactions this way but in chemistry can I if now why? 2K + 2(H20) yields 2KOH + H2 2(K + H20) yields 2KOH + H2 can I also do this if not why? 2(CO) + O2 yields 2(CO2) O(2C + O) Yields 2(CO2) I dont see why I cant do any of these ...
July 3, 2010

Chemistry
I have realized I don't understand Avagado's number at all My book shows me this diagram instead of just providing a simple formulas that makes no sense at all here is what I have made sense of so far (6.022 x 10^23 atoms/mol)(mass of element) = molecular mass were ...
July 3, 2010

Chemistry
What is wrong with or ambiguous about hte phrase "four molecules of NaCl" I really dont understand my textbook says in the back that it is an ionic compound so I guess that its not really a molecule then I don't understand...
July 2, 2010

AP Biology
I got a question that comes from the 1990 released test #61 that I'm completley lost on 61. In a population that is in Hardy-Weinberg equilibrium, the frequency of a recessive allele for a certain hereditary trait is 0.20. What percentage of the individuals in the next ...
July 2, 2010

Public High School AP Biology
I got a question that comes from the 1990 released test #61 that I'm completley lost on 61. In a population that is in Hardy-Weinberg equilibrium, the frequency of a recessive allele for a certain hereditary trait is 0.20. What percentage of the individuals in the next ...
July 1, 2010

physics
danks 4 includN units kid refuse to solve w/o dem sorry
July 1, 2010

Chemistry (algebra I problem)
I feel really dumb because I cant figuer out this simple algebra I problem... 84. The diameter of a copper (Cu) atom is roughly 1.3 x 10^-12 m. How mnay times can you divide devenly a piece of 10-cm copper wire until it is reduced to two seperate copper atoms? (Assume there ...
June 28, 2010

Public High School AP Biology
I got a question that comes from the 1990 released test #61 that I'm completley lost on 61. In a population that is in Hardy-Weinberg equilibrium, the frequency of a recessive allele for a certain hereditary trait is 0.20. What percentage of the individuals in the next ...
June 22, 2010

Chemistry
What is the pH of a 0.42 M NH4NO3 aqueous solution? What is the percent ionization?
June 20, 2010

Chemestry
What is the pH? 1.6 x 10^(-5)?
June 19, 2010

Algebra
Thanks!
June 18, 2010

Algebra
Is this correct? If not can you please tell me what steps I did wrong? Thanks! The hydrogen ion concentration of milk is about 1.6 x 10^-7 moles per liter. Find the pH. pH = -log [H+] pH = -log[1.6 x 10^-7] pH = -(-7.204119983) pH = 7.2 The pH balance of the milk is 7.2
June 18, 2010

Calc
I'm kind of rusty on my calc here... ok ther's a graph of velocity vs time w/ velocity in m/s and time in seconds were time is of course the x-axis k I'm asked to describe how the velocity changes over the timer interval in this interval the graph consists of three...
June 17, 2010

Algebra
It is actually for an Intermediate Algebra class. Logitharims.
June 17, 2010

Algebra
The hydrogen ion concentration of milk is about 1.6*10^-7 moles per liter. Find the pH.
June 17, 2010

Calculus
How to prove this (e^(2^-1 i3pi) - e^-(2^-1 i3pi))/(2i) = -1 if you could show me this that would be really great btw e is eulers number i = imaginary number sqrt -1 and pi = 3.14... THANKS!!!
June 11, 2010

Algebra 2
a rectangle table is five times as long as it is wide if the area is 245 feet ^2 find the length and width of the table
June 7, 2010

chemistry
How much Fe++ could be present in water containing 0.8 x 1e-02 M HCO3- (bicarbonate) without causing the precipitation of FeCO3 (Ksp=10**(-10.7))
June 4, 2010

Chemistry
nevermind..i got it
May 26, 2010

Chemistry
Magnesium fluoride dissolves in water to the extent of 8.0 10-2 g/L at 25°C. Calculate the solubility of MgF2(s) in moles per liter, and calculate Ksp for MgF2 at 25°C. I've been doing this and getting .086. Please help!
May 26, 2010

Algebra
Write an equation of the line satisfyingg the given conditions. Slope = -2/3; y-intercept of 2
May 23, 2010

Math (trig)
4cos(x)+5=6sec(x)
May 20, 2010

Algebra
Determine whether the lines are parallel, perpendicular, or neither. y = 9x + 9 and y = -9x + 9
May 16, 2010

Algebra
Write an equation of the line satisfying the given conditions. Horizontal line through (-2, -5)
May 16, 2010

Math
Thanks, I am so lost.
May 16, 2010

biology
Pick one of the multiple choice that best matches the answer. For grasshoppers and locusts to be in the same family they must also be in the same a. order b. group c. genus d. species two members of the same ___ would be most clostly related. a. order b. group c. genus d. species
May 13, 2010

spanish
what is the conjugation for I listened He use to take I slept
May 12, 2010

Economics
Programs aimed only at people who are poor or disabled are known as? a. social insurance programs b. governmental programs c. federally funded programs d. public assistance programs
May 10, 2010

PreCalculus REINY HELP PLEASE
well yay thanks for the answer but i really need the formula lol I tried to derive it on my own but it was a little bit rough lol i need the formula it wasn't in my book and I don't know what the name of the formula would be so i can't really google it...
April 28, 2010

PreCalculus
Hi im unsure how do this problem becasue I do not how to go about these types of problems were you make monthely payments each month of the same amount... Janene contributes $50 per month inot the Chaing China Bond Fund htat earns 7.26% annual intrerest. What is the value of ...
April 28, 2010

Precalculus
Hi im unsure how do this problem becasue I do not how to go about these types of problems were you make monthely payments each month of the same amount... Janene contributes $50 per month inot the Chaing China Bond Fund htat earns 7.26% annual intrerest. What is the value of ...
April 28, 2010

PreCalculus
Still need help please post in this one that way i don't have to search through the old stuff h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 2 3 2 6 8 8 0
April 27, 2010

Precalculus
please still stuck h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 2 3 2 6 8 8 0
April 26, 2010

PreCalculus
Hi i don't know how to do this problem solve for n^3 given that log(40 SQRT(3))/log(4n) = log(45)/log(3n) Thanks i'm copletely lost and don't know how to solve
April 26, 2010

PreCalculus
question skipped again please post response in this one so that way I don't have to search for old posts h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 2 2 4 7 5 4 8
April 26, 2010

Precalculus
please post response in this forum so i don't have to search for the old one u skipped this question still need help h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 7 2 2 4 0 9 7 0
April 25, 2010

PreCalculus
Hi im unsure how do this problem becasue I do not how to go about these types of problems were you make monthely payments each month of the same amount... Janene contributes $50 per month inot the Chaing China Bond Fund htat earns 7.26% annual intrerest. What is the value of ...
April 25, 2010

human resources
How can a technology manager help their company to grow?
April 7, 2010

chemistry
How do you find out how many moles of water were produced in this reaction?
April 6, 2010

chemistry
How many moles of acid were present in 50 ml or 1.0M HCl? How many moles of water were produced in this reaction?
April 6, 2010

mathematics in our world
how often do you run red lights
April 4, 2010

math
surface area of a rectangular prisms i have one with the same # on each side how many times should i * it
March 31, 2010

band
i play the clarinet i was just wondering if anyone knew any good website to practice
March 31, 2010

band
can you give some music leaning site
March 31, 2010

Probability/Stas
does that mean sixty of them
March 31, 2010

Probability/Stas
10 20
March 31, 2010

math
i have to find the suface area of rectangular prisms here is the problem 9*2.1 2.1*4.4 4.4*9 i got 135.48 is that right
March 31, 2010

4th grade math
4x27
March 30, 2010

Spanish
El Laberinto del Fauno Guillermo del Toro Escribe 3 -4 frases para cada pregunta. Responde a dos preguntas en español, y a dos preguntas en inglés. i need help answering these questions in spanish? 1) ¿Están enamorados el capitán y la madre ...
March 30, 2010

Precalc
I think it was skiped can you post resposne in this question h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 9 8 2 9 1 7 1
March 28, 2010

PreCalc
[b]1. The problem statement, all variables and given/known data[/b] The average growth rate of the population of a certain city is 7.5% per year. The city's population is now 22,750 people. What is the expected population in 10 years? [b]2. Relevant equations[/b] I was ...
March 28, 2010

axia
how do social dominance and courtship diplays have an impact on evolution
March 24, 2010

social studies
6th grade question:what were greek city-states and how did they function
March 24, 2010

japanese
How would you say: next month on April 14th I am going with my parents on vacation to Hawaii. In katakana and hirgana only please.
March 20, 2010

Math-Rational #'s
Just trying to understand this. Please let me know if I did these right. Thanks!!! -7 as a rational # = -7/10 -3.03 as a rational # = -33/10 -2 3/12 as a rational # = -25/12 1.03 as a rational # = 13/10
March 15, 2010

Statistics
A die that is fair will have each face of the die come up one-sixth of the time in the long run. The population for die throwing contains the results of throwing the die an infinite number of times. For this problem, the parameter of interest is p is the probability of rolling...
March 9, 2010

Statistics
A student group claims that first-year students at a university must study 2.5 hours (150 minutes) per night during the school week. A skeptic suspects that they study less than that on the average. A class survey finds that the average study time claimed by 269 students is = ...
March 9, 2010

Physics
A person walks 24.0° north of east for 2.80 km. How far would another person walk due north and due east to arrive at the same location?
March 9, 2010

PreCalculus
I'm unsure how to even start this problem Solve for x: Arctan( -4/5 ) + Arcos (2/SQRT(5) ) = Arctan(x)
March 9, 2010

college english
that's helps a whole lot! thanks so much Ms Sue and Writeacher! :D
March 7, 2010

college english
In the essay, I have to demonstrate that I recognize logical fallacies, but I don't understand how I can write that much about a message of somebody else when they have written so little. there's just nothing else to speak of, and I only have 500 words
March 7, 2010

college english
what do you mean by newspaper's op ed page?
March 7, 2010

college english
I was told in class to find a piece of "biased writing" and use the knowledge about critical thinking. how would i know whether an article is biased? really confused. also, it's a 1000 word essay, so it'd be really nice to get answer!
March 7, 2010

Physics (Heat Engines)
wait no the answer is A how though?
March 6, 2010

Physics (Heat Engines)
21. A heat engine operates in a cycle between temperatures 700 K and 400 K. The heat input to the engine during each cycle is 2800 J. What is the maximum possible work done by the engine in each cycle? (A) 1200 J (B) 1600 J (C) 2100 J (D) 2800 J (E) 4400 J I believe that the ...
March 6, 2010

Math
yes, it does! Thank you!
March 3, 2010

Math
zero
March 3, 2010

Math
suppose the temperature is -12 degrees F and rises 4 degrees every hour for 3 hours. What will the temp b then? Can you please help me write out the equation? Thanks
March 3, 2010

pre calc
A ramp leading to a freeway overpass is 470 feet long and rises 32 feet. What is the angle of inclination of the ramp?
March 3, 2010

Physics 103
How do I start? Problem: A helium nucleus (m= 6.65 x 10^-27 kg and q = 2e)is initially at rest. It is accelerated through a potential difference delta V and then enters a region with a constant magnetic field of strength B= 4T. It enter perpendicular to the field and undergoes...
March 2, 2010

Physics 103
So I have a question about magnetism. A charged particle moves through a region of space and experiences no magnetic force. Does that mean that the magnetic field is zero?
March 2, 2010

math
i have the capacity of 1 literbut all the water in the ocean can not fill me up.what am i?
March 2, 2010

Chemistry
Bromine can be added to limonene to create a brominated compound. When 613 mg of limonene and 3.5 mL of a 10% (v/v) solution of Br2 in dichloromethane (a solvent) are combined, 959 mg of the product is isolated. Calculate the percent yield for this reaction. If the limonene ...
March 2, 2010

Physics
h t t p : / / i m g 7 1 5 . i m a g e s h a c k . u s / i m g 7 1 5 / 2 7 6 9 / c a p t u r e q u . j p g I need help with c. for a. I got v = sqrt(2gR) for b. I got v = sqrt(gR) for c. I'm stuck
March 1, 2010

RESPONSE to PreCalc
I like how Jishka adds random symbols to my posts lol awsome :O
March 1, 2010

RESPONSE to PreCalc
Makes complete sense thank you so much!!! My only question is how come we respect domains only sometimes... For example now sin©¬/cos©¬ = (1/a)/(¡î3/a) = 1/¡î3 tan©¬ = 1/¡î3 ©¬ = 30¨¬ or pi/6 then ...
March 1, 2010

Precalculs
I have no idea how to do these type of problems. -------Problem-------- Solve each equation on the interval 0 less than or equal to theta less than 2 pi 42. SQRT(3) sin theta + cos theta = 1 ---------------------- There is an example prior to the excersises that attempts to ...
February 28, 2010

Physics
h t t p : / / i m g 2 0 5 . i m a g e s h a c k . u s / i / c a p t u r e b b . j p g / i am stuck on part c how do i find work with out using the spring constant work equals force parallel times displacement at which the force is acted during... Work done by spring = .5 kx^2 ...
February 28, 2010

Math--Exponential Functions
Suppose an investment of $500 doubles in value every 15 years. How much is the investment worth after 30 years? After 45 years? please help!!! i don't even understand how to approach this problem! =(
February 28, 2010

Physics
hmmmmmm thanks
February 28, 2010

Physics
h t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 6 7 3 9 3 5 9 3 ok heres the problem in a picture h t t p : / / i m g 1 9 2 . i m a g e s h a c k . u s / i m g 1 9 2 / 4 5 0 0 / c a p t u r e x x w . j p g ok I called the 4 kg block m3 and the 2 ...
February 28, 2010

Physics
wait no 12 N
February 28, 2010

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