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October 1, 2014

Posts by Shreya


Total # Posts: 221

chemistry
What must be the velocity of a beam of electron if they are to display a de broglie wavelength of 1A°?
July 6, 2014

Ms sue please help
Thanks a lot Writeacher :)
May 13, 2013

Ms sue please help
Hey ms sue can you please help me to simplify this paragraph? Raynaud's disease occurs when the small arteries (arterioles) that serve the fingers, toes, ears, or nose go into spasm. When arterioles go into spasm, they cut off blood supply and cause digits (fingers and ...
May 13, 2013

Raynaud's
I want to know what Raynaud's basically is. I know that blood flow is stopped to the fingers and toes, because blood vessels tighten or something when they are exposed to cold, and there are other factors as well.
May 11, 2013

Raynaud's
Hey I want to shorten this paragraph out which tells what Raynaud's is, can anyone please simplify it and make it shorter thanks? Raynaud's disease occurs when the small arteries (arterioles) that serve the fingers, toes, ears, or nose go into spasm. When arterioles go...
May 11, 2013

Biology Raynaud's Disease
Hey im doing a powerpoint presentation on this raynaud's disease, and could someone please give me some good sites to go through to get info abt this and please mention anything you know about the raynaud's disease as well, thanks.
April 30, 2013

Biology - URGENT Enzyme Lab
Did a catalase producing hydrogen peroxide lab, used manganese dioxide, fresh frozen liver, potato, ice, fine clean sand, etc. Basically just added hydrogen peroxide to the catalysts under diff conditions and stuff. Just dont get this question which is : how do you account for...
April 5, 2013

Biology Difference b/w Heat Exhaustion/Heat Stroke
I want to know the causes of heat stroke and heat exhaustion. I cant seem to find separate causes for the two, finding very different answers online :|
February 8, 2013

Biology
Hey I am doing a lab, the link is down h t t p : //w w w . sd67 . bc . ca/schools/salc/biology%2012/module%20c%20-%20human%20biology/unit%2010%20-%20respiratory%20system/Homeostasis%20Lab .pdf And I really would like help with #1 My data is right here Pre exercise 0 min - Temp...
February 7, 2013

Chemistry 12
which of the following 0.10M solutions is basic? A LiCl B K3Po4 C NaCLO4 D NH4NO3 Is it C?
January 25, 2013

Chemistry 12
Thank you soo much :) I can totally see you as a smart Chemist in the future :)
January 25, 2013

Chemistry 12
Thank you soo much, that makes so much sense :)
January 25, 2013

Chemistry 12
define the term strong bronsted lowry acid it is 100% ionized in solution? is that it?
January 25, 2013

Chemistry 12
name a compound that acts as a weak base? methanol? define the term weak bronsted-lowry base im not sure how to put this in words, but a weak base is found when you got a strong acid, when your ka is high, kb will be low.
January 25, 2013

Pre Calculus 12
Oh but this is a multiple choice question and the only answers that it can be are A 144 B 72 C 24 D 1728
January 25, 2013

Pre Calculus 12
permuations an orchestra has 2 violinsts, 2 cellisst, and 4 harpists. Assume that the players of each instrument have to sit together, but they can sit in their own group. In how many ways can the conductor seat the members of the orchestra in a line? I just went 4*3*2 and got...
January 25, 2013

Chemistry 12
Thanks soo much to both of you :)
January 25, 2013

Chemistry 12
Thanks so much :) So if we were to find the Ka, then we would use the ka on the acid side of the chart?
January 25, 2013

Chemistry 12
How do you know which ka to use? There is one on the base side of the chart, and one of the acid side of the chart. For the one of the acid side of the chart, the Ka is 2.2*10^-13 And for the one on the base side of the chart, it is 6.2*10^-8.
January 25, 2013

Chemistry 12
The value of Kb for HPO₄²- is? A. 2.2*10^-13 B. 6.2*10^-8 C. 1.6*10^-7 D. 4.5*10^-2 I dont get how to solve this.
January 25, 2013

Chemistry 12
Aww thanks soo much buddy :)
January 25, 2013

Chemistry 12
The [OH-] of a solution with a PH 5.75 is is it 5.6*10-9M?
January 25, 2013

Pre Calculus 12
Oh that makes sense, thank you :)
January 24, 2013

Pre Calculus 12
Identify the point on the unite circle coressponding to an angle of 300 degrees in standard position A (-√3, -√3/2) B (-√3/2, 1/2) C (1/2, -√3/2) D (1/2, -√3 ) I dont get how to figure this out :|
January 24, 2013

Pre Calculus 12
Another sine/cosine question i dont get in vancouver on certain day, high tide is 20m at 2am, the next low tide is 8m at 6am, what an equation that represents height (h)of water at any time (t)since midnight) what is the height of water at 8:45AM? What is height of water at 8:...
January 23, 2013

Pre Calculus 12
Modelling with sine/cosine A Ferris wheel has a diameter of 30m. The bottom of the wheel is 1.5m off the ground it takes 3.5min to make one complete revolution. a person gets on ferris wheel at its lowest point at time = 0. write an equation that represents persons height ...
January 23, 2013

Pre Calculus 12
The height h, in metres, above the ground of a car as a ferris wheel rotates can be modelled by the function h(t) = 18cos(πt/80) +19 what is the minimum height of a car? do i like subtract 19 from 18 ? what is the maximum height of a car? do i add the 19 to 18? how long ...
January 23, 2013

Pre Calculus 12
so you added 10 and 2 to get 12, and amplitude is the middle of max and min? how did you get the axis 4 units? a period is always twice of something? the phase shift is sort of confusing me, because isnt that just between the x values? 2, and 5? is there some other way to ...
January 23, 2013

Pre Calculus 12
Graphing trigonometric functions A sinusoidal function has a maximum at (2,10) and its next minimum (5,-2) find an equation that represents this situation A sinuosoidal function has a zero at (5,0) and its next minimum is (7,-4). find an equation that represents this situation...
January 23, 2013

Pre Calculus 12
Thanks very much Reiny :)
January 23, 2013

Pre Calculus 12
Laws of logarithms evualuat using change of base rule log(√8)16 ^the square root 8 is supposed to be subscript. the answer i got was 8/3, not sure if that is right
January 23, 2013

Pre Calculus 12
thanks soo much Reiny :) You are such a great math helper on here! :D
January 23, 2013

Pre Calculus 12
how do i log both sides? divide by 2000 on both sides?
January 23, 2013

Pre Calculus 12
Solving problems that involve logarithms the sound at a rock concert decreases by 10% for every 5m travvelled. how far does it take for a volume of 2000 decibels to decrease to 20 decibels? i dont know what to do for this one the growth decay formula i got is A = P(X)^t/n I ...
January 23, 2013

Pre Calculus 12
Thanks very much Reiny :)
January 23, 2013

Pre Calculus 12
Laws of Logarithms Evaluate: without using a calculator, except for the first one. The 5.6 is supposed to be subscript, but i dont know how to make it small. 4log(5.6)84 log84/log5.6 Do I multiply this by four or something? both of the logs?
January 23, 2013

Pre Calculus 12
How is 5y-3 is a common denominator?
January 22, 2013

Pre Calculus 12
Could you explain why it wouldnt be 1/5x again? Because isnt there an invisible 1 beside the x, and so when we divide the 5 doesnt it become 1/5x? For the second equation to get rid of 5y-3 on the bottom you multiply it on the other side? Could you explain step by step the ...
January 22, 2013

Pre Calculus 12
Oh okay that makes sense, Im just sort of still confused with how the answer to the first one needs to be layed out I got y = ³√(1/5x) +3 And yes that is a new equation on my second post, and yeah I meant that, sorry will remember to put brackets next time.
January 22, 2013

Pre Calculus 12
And I do not get this one y = x-2/5x-3 x = y-2/5y-3 ?
January 22, 2013

Pre Calculus 12
Where did you get 4 from? For the first one? Where you wrote in original let x = 4?
January 22, 2013

Pre Calculus 12
I also do not get these inverses questions y = 5(x-3)^3 x = 5(y-33)^3 I divided 5 on both sides and got 1/5x = (y-3)^3 Then do I cube root the 1/5x or something to get rid of of the cubed on (y-3)? Also y = x-2/5x-3
January 22, 2013

Pre Calculus 12
Thanks Reiny that makes soo much more sense :)
January 22, 2013

Pre Calculus 12
For the second step, to get rid of a fraction on the bottom, we always multiply it with every term? And if we are dividing something, then we divide it by every term? K i get how you got 6, but I still dont get how to get the x+4 ?
January 22, 2013

Pre Calculus 12
thanks Reiny but the answer says y=3/2(x+4) is it supposed to be 6?
January 22, 2013

Pre Calculus 12
Im trying to find the inverse of this: y = 2/3x-4 I got to this step x+4 = 2/3y I need to divide by 2/3 to get rid of 2/3 beside the y, but i dont know how to divide x+4/2/3 that looks complicated :\
January 22, 2013

Pre Calculus 12
Im going over my pre calculus 12 exam, and I need help with one question from the chapter Transformations of graphs and stuff. Combining Transformations 2y = f(5x-10)+8 The original points are (4,6) and the new points I got by translating it and stuff are : (14/5,20) But in ...
January 22, 2013

maths
U+2085
January 19, 2013

Pre Calculus 12 urgent
andrew is working on a binomial problem (1/2x-y)^7. He asks u to : i) what the coefficient of the 6th term ii) find the term that has the variabes x^47^3 (ex. 34x^4y^3) iii) find the first three terms of the expansion I really need help with that ^ . I know the powers of A ...
January 18, 2013

Pre Calculus 12
Im on the chapter of permutations/combinations/fundamental counting principle need help with 2 questions 1. emma is arranging her books in piles on her desk. she has 5 math books, 3 english books, and 4 science books. how many ways can she arrange them if she wants to keep the...
January 18, 2013

Pre-Calculus
Same problem with this question The angle θ is in the fourth quadrant, and tan θ = -3/7. Point P is on the terminal arm of angle θ. Which is a possible coordinate for P? A) -21,9 B) 9,-21 C) -9,21 D) 21,-9
November 14, 2012

Pre-Calculus
The angle θ is in the second quadrant and tan θ = -3/5. Point P is on the terminal arm of angle θ/ Which is a possible coordinate for P? A) (-5,√29) B) (-3,√29) C) (-10,6) D) (-6,10) I drew the triangle, and aren't the coordinates supposed to be...
November 14, 2012

Pre-Calculus
Thanks so much :)
November 6, 2012

Pre-Calculus
Trigonometric Functions, Radian Measure ∏ <-- will be using this for pi Using exact values, convert to radians ( hint use fraction of ∏) 90° = 90°*∏/180° = 1∏/2 ^^would it be right to also call it 2∏ radians? Determine the angle at ...
November 6, 2012

Pre-Calculus
Applications of Logarithms I really need help with this log stuff please. If the PH of acetic acid is 5, what is the PH of hydrochloric acid if it is 200 times more acidic? the formula is right here: P=P0*10^PH2-PH1 200=10^5-PH1 log200=(5-PH1)log10 And I dont know where to go ...
October 20, 2012

Pre-Calculus - Reiny
Reiny you helped me with this logarithm yesterday: How did you write it out as log2 ( √A / B^3 ) Laws of logarithms combine, write as a single logarithm Need help on this question please, Im stuck, dont know where to go abouts from here: I did it on paint and uploaded it...
October 17, 2012

Pre-Calculus
Laws of logarithms combine, write as a single logarithm Need help on this question please, Im stuck, dont know where to go abouts from here: I did it on paint and uploaded it onto this website because I dont know how to do the subscript numbers, so it probably wouldnt really ...
October 16, 2012

Pre-Calculus
Laws of Logarithms Without using a calculator use the change of base rule to evaluate 1. a) log(subscript8)32(hint use base 2) =log(subscript2 32)/log(subscript2 8) = 5/3 b) log(subscript36)1296. This one doesnt even give you a hint, so how do you know which base to use? Does ...
October 16, 2012

Pre-Calculus
Oh so they always have to be in hours? growth periods are always in hours?
October 16, 2012

Pre-Calculus
Exponential Functions A=P(X)^t/n A-final amount P-initial amount X-growth rate t-time n-number of growth periods The teacher had this question as an example and did it however i do not understand one thing: The Ebola virus double every 30 min. If there are currently 2000 ebola...
October 16, 2012

Pre-Calculus
Exponential Functions This is my equation that models the accumulated amount (A) at any time t. A = 1000(1+0.08/12)^t*12 ^ How do I plot that into the graphing texas instruments calculator? What I do I type in the y-axis?
October 8, 2012

Pre-Calculus
solve by fully factoring x^3-7x-6=0 How would I fully factor this?
October 2, 2012

Pre-Calculus
Radical Functions Graph y=(x-3)(x+2) and y=√(x-3)(x+2). where are the x-intercepts of each function ?why? for the first one, i know that whatever is inside the brackets is opposite, so the x intercepts would be at 3, and -2. but the whole radical thing is it the same ...
October 2, 2012

Pre-Calculus
for the last two you did how do you know the x is becoming large like that whole infinity thing?
October 2, 2012

Pre-Calculus
sorry that was the wrong question I meant the degrees of these one were both the same: y = x^2+5x-6/x-3x^2+9 the leading coefficient is 1, so the vertical asymptote would be one?
October 2, 2012

Pre-Calculus
Rational Functions y = (x^2+7x-4)/(x-2) Since the degrees of both the numerator and denominator are the same, I would use the leading coefficient, and both the rational functions start with 1, so would the horizontal asymptote be 1? Also dont get how to find the horizontal ...
October 2, 2012

Pre-Calculus
Rational Functions does the following function have a hole or a vertical asymptote or both? how do you know? find the y-value at that point. y=x^2+7x+12/x^2+8x+15 I factored this out to y = (x+3)(x+4)/(x+5)(x+3) The x+3's cancelled out. I dont get the whole verticle and ...
October 2, 2012

Chemistry
Alright but since heat is released wouldn't it be negative? the H notation?
September 30, 2012

Chemistry
I'm having a hard time understanding Endothermic and Exothermic reactions, like their standard format and stuff. For Exothermic reactions the heat is getting released into the surroundings, the products will be less than the reactants, so I would assume the products to be ...
September 30, 2012

Pre-Calculus
Composition of Functions If f(x) = 2x+1 find A. f o f(x) f(f(x)) = f(2x+1) f(2x+1) = 2(2x+1) f(f(x)) = 4x +2 B. f o f o f o f(x) ^ I dont get how to solve this one C. f o f o f o f o f ...o f(x) n functions of f ^ I also dont get how to solve this one given f(x) = ax+b and g(x...
September 27, 2012

Pre-Calculus
Composition of Functions f o g(x)=f(g(x)) --> I know that this is eqivalent to f(g(x)) Given f(x) = 2x+1, and g(X) = 3x+1 find:f o g(x)=f(g(x)) This is what I did, but I don't think Ive solved it correctly f(g(x)) = f(x-3) f(x-3) = 1(x-3)-3x+2 =x-3-3x+2 f(g(x)) = -2x-1 ...
September 27, 2012

Pre-Calculus
Operations with Functions write the function below as either a sum/difference/product/quotient of 2 r more functions a. h(x) = x^2+3x+9 How Would I do this? My teacher just did this f(x) = x^2 g(x) 3x+9 ^I dont really understand h(x)=(x+5)(x-3) how would I do this one? If h(x...
September 26, 2012

Pre-Calculus
Graphing Polynomials Decide whether each of the following is sometimes true, always true, or never true and explain reasoning. A. A cubic function has 2 different x-intercepts ^Never true, has to have 3? B. A cubic function has 3 x-intercepts ^ Always true C. A quartic ...
September 26, 2012

Chemistry
if you double the concentration of HCL acid, will that double rate of reaction? i have to explain in terms of the theory of collision. Wont doubling the concentration double the rate as well?
September 25, 2012

Chemistry
Thanks so much, does the amount of acid also matter? like 2.0M or 6.0M? and if its powdered that also increases the reaction rate right?
September 25, 2012

Chemistry
out of these conditions, which would result in fastest reaction? a. 2.0M HCL, powedered CaCO3 chip, 50 degrees celsius b. 6.0M HCL, CaCO3 chip, 25 degrees celsius c. 6.0M HCL, powdered CaCO3, 50 degrees celsius. d. 2.0M HCL, CaCO3 chip, 50 degrees celsius. Im guessing C ...
September 25, 2012

maths
(18/9(4-2)+5)
September 23, 2012

Pre-Calculus
-5x divided by x, how come that equals -5, but not -5x, how do the x's cancel out?
September 18, 2012

Pre-Calculus need help in an Hour before test
I still dont understand the whole process
September 14, 2012

Pre-Calculus need help in an Hour before test
The question in my book only has brackets around (x+5/2)
September 14, 2012

Pre-Calculus need help in an Hour before test
y=f(x+5/2) I timesd x+5 by 2 to get rid of 2 at the bottom and timesd y by 2. Then to get rid of 2 from y i divided it, and i got this. y=1/2f(x+5) however my teacher got y=f(1/2(x+5)) what did i do wrong?
September 14, 2012

Pre-Calculus
Need help with this question, dont get it. Given the relation x^2+3x=y^2-2y, what is the new relation if it has undergone: A. vertical expansion by 2 B. Horizontal expansion by 3 C. Vertical compression by 4/5 D. Horizontal compression by 1/5 E. Reflection over yaxis, vertical...
September 13, 2012

Pre-Calculus Graphs expansions/compressions
Need help with this question, dont get it. Given the relation x^2+3x=y^2-2y, what is the new relation if it has undergone: A. vertical expansion by 2 B. Horizontal expansion by 3 C. Vertical compression by 4/5 D. Horizontal compression by 1/5 E. Reflection over yaxis, vertical...
September 12, 2012

Biology
thanks a lot Ms. sue :)
March 4, 2012

Biology
Individuals whose characteristics are well-suited to their environment survive. Individuals whose characteristics ar not well-suited to their environment either die or leave fewer offspring. This principle Darwin called survival of the fittest. how i rewrite this definition in...
March 4, 2012

biology tutor on jiskha
thank you this just like jiskha? free site?
February 22, 2012

biology tutor on jiskha
i post my biology questions here today and few days ago no teacher reply. there not any biology tutor on here?
February 22, 2012

biology
any site i go onto that be animation site to find out about nucleic acids and protein synthesis? this chapter soo hard. codon, anticodon i need animation.
February 22, 2012

biology what is DNA
why is DNA replication necessary to life?
February 22, 2012

biology
why DNA replication necessary to life?
February 21, 2012

Biology- DNA
why dna replication necessary to life? i think it because it carry genetic information?
February 20, 2012

biology anyone..
no im not sure. i dont know if i scale. and how?
February 16, 2012

biology anyone..
please i need this by tomorrow. if nucleii are 3 micrometres long, how big are the cells? these r 2 questions i not get.
February 16, 2012

biology - What Am I?
this is for plant cell is it chloroplast?
February 16, 2012

biology
this part of organism usually found underground, what organele conspicuously absent?
February 16, 2012

easy math
nevermind i get what i doing wrong.
January 31, 2012

easy math
I converting 0.001mm to micrometers using staircase method and micro come under millimeter, so that mean move one decimal to right so would it not be 0.01?
January 31, 2012

easy math
thanks Ms. sue for helping =)
January 31, 2012

easy math
i want know how to say this in words. I try myself in brackets. i am doing this for bio class so if i have to speak out loud tomorrow i be able to correctly say numbers. 1 585 000 000 ( 1 billion, 585 million hundred thousands) 1 585 000 ( 1 million, five hundred and eighty ...
January 31, 2012

chemistry
i actually doing this first time and i real not get how to do this how i find out how many mole Sb in one gram?
January 25, 2012

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