# Posts by kate

Total # Posts: 2,016

**Trig**

Even if you have no idea what on earth any of this stuff is but have a vast knowledge in complex number system you might be able to help me as this is what I believe is preventing me from making sense of this stuff... Ok I'm trying to understand how you would know that sin...

**Algebra I**

Did I do these probelms correctly? Find the intercepts 1. y^2 = x^2 - 4x y^2 = x(x - 4) Y intercepts y^2 = 0(0 - 4) (0,0) x intercepts 0 = x(x - 4) 0 = x - 4 4 = x (4,0) 2. y = (x (x + 3))/(3x + 1)^2 y intercetps y = (0(0 + 3))/(3(0) +1)^2 y = 3/1 (0,3) x intercepts 0 = (x (x...

**Algebra**

see like I'm kind of confused by this as well isn't this more simple x^-1 rather than 1/x ? can you please give like a deffinition of "simple" for equations what does it mean for an equation to be in it's most simplest forms? That I can apply to any ...

**Algebra**

Which one is more "simple"? (-7(2x + 3))/(x(x + 3)) or (-14 x + 21)/(x^2 + 3x) I would go with the factored form but i'm still kind of confused as to what exactly what it means for an equation to be "simple"

**Algebra**

I'm kind of confused as to what exactly simplified means by deffintion which one is more simple (2x)^6 or 64x^6 I thought simplified meant to do all the operation that can be done... but I've had some teachers who've makred that wrong because I didn't factor...

**Algebra**

What does it mean to be "simplified" which one is most "simple" 2(3+5) or 6 + 10 ??? I've been told both and wonder if someone can give me the correct answer some of my teachers told me simplified means all of the operations that can be done are done ...

**NEVERMIND**

figuered it out

**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?

**Calc**

ok this is now an algebra question...

**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/...

**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

**Jishka Staff**

Oh is there another one or are there no more on here who teach biology besides that teacher?

**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

**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

**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...

**Sorry**

didn't know see your posts let me read them ignore these posts for the moment sorry :(

**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...

**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 ...

**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 ...

**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

**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 ...

**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 ...

**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(....

**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?

**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 ...

**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 don't see why I cant do any of these ...

**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 ...

**Chemistry**

What is wrong with or ambiguous about the phrase "four molecules of NaCl" I really don't 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...

**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 ...

**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 ...

**physics**

danks 4 includN units kid refuse to solve w/o dem sorry

**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 separate copper atoms? (Assume there ...

**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 ...

**Chemistry**

What is the pH of a 0.42 M NH4NO3 aqueous solution? What is the percent ionization?

**Chemestry**

What is the pH? 1.6 x 10^(-5)?

**Algebra**

Thanks!

**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

**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...

**Algebra**

It is actually for an Intermediate Algebra class. Logitharims.

**Algebra**

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

**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!!!

**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

**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))

**Chemistry**

nevermind..i got it

**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!

**Algebra**

Write an equation of the line satisfyingg the given conditions. Slope = -2/3; y-intercept of 2

**Math (trig)**

4cos(x)+5=6sec(x)

**Algebra**

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

**Algebra**

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

**Math**

Thanks, I am so lost.

**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

**spanish**

what is the conjugation for I listened He use to take I slept

**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

**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...

**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 ...

**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 ...

**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

**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

**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

**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

**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

**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 ...

**human resources**

How can a technology manager help their company to grow?

**chemistry**

How do you find out how many moles of water were produced in this reaction?

**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?

**mathematics in our world**

how often do you run red lights

**math**

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

**band**

i play the clarinet i was just wondering if anyone knew any good website to practice

**band**

can you give some music leaning site

**Probability/Stas**

does that mean sixty of them

**Probability/Stas**

10 20

**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

**4th grade math**

4x27

**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 ...

**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

**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 ...

**axia**

how do social dominance and courtship diplays have an impact on evolution

**social studies**

6th grade question:what were greek city-states and how did they function

**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.

**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

**Chemistry**

8 h2o

**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...

**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 = ...

**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?

**PreCalculus**

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

**college english**

that's helps a whole lot! thanks so much Ms Sue and Writeacher! :D

**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

**college english**

what do you mean by newspaper's op ed page?

**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!

**Physics (Heat Engines)**

wait no the answer is A how though?

**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 ...

**Math**

yes, it does! Thank you!

**Math**

zero

**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

**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?

**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...

**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?

**math**

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

**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 ...

**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