Tuesday

July 29, 2014

July 29, 2014

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°?

**Ms sue please help**

Thanks a lot Writeacher :)

**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 toe...

**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.

**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...

**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.

**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...

**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 :|

**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...

**Chemistry 12**

which of the following 0.10M solutions is basic? A LiCl B K3Po4 C NaCLO4 D NH4NO3 Is it C?

**Chemistry 12**

Thank you soo much :) I can totally see you as a smart Chemist in the future :)

**Chemistry 12**

Thank you soo much, that makes so much sense :)

**Chemistry 12**

define the term strong bronsted lowry acid it is 100% ionized in solution? is that it?

**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.

**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

**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...

**Chemistry 12**

Thanks soo much to both of you :)

**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?

**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.

**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.

**Chemistry 12**

Aww thanks soo much buddy :)

**Chemistry 12**

The [OH-] of a solution with a PH 5.75 is is it 5.6*10-9M?

**Pre Calculus 12**

Oh that makes sense, thank you :)

**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 :|

**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:...

**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 abov...

**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 d...

**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 figu...

**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...

**Pre Calculus 12**

Thanks very much Reiny :)

**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

**Pre Calculus 12**

thanks soo much Reiny :) You are such a great math helper on here! :D

**Pre Calculus 12**

how do i log both sides? divide by 2000 on both sides?

**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 do...

**Pre Calculus 12**

Thanks very much Reiny :)

**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?

**Pre Calculus 12**

How is 5y-3 is a common denominator?

**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 who...

**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.

**Pre Calculus 12**

And I do not get this one y = x-2/5x-3 x = y-2/5y-3 ?

**Pre Calculus 12**

Where did you get 4 from? For the first one? Where you wrote in original let x = 4?

**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

**Pre Calculus 12**

Thanks Reiny that makes soo much more sense :)

**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 ?

**Pre Calculus 12**

thanks Reiny but the answer says y=3/2(x+4) is it supposed to be 6?

**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 :\

**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 th...

**maths**

U+2085

**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 dec...

**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...

**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

**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 ...

**Pre-Calculus**

Thanks so much :)

**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 ...

**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 ...

**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...

**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 h...

**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 ...

**Pre-Calculus**

Oh so they always have to be in hours? growth periods are always in hours?

**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...

**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?

**Pre-Calculus**

solve by fully factoring x^3-7x-6=0 How would I fully factor this?

**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 pro...

**Pre-Calculus**

for the last two you did how do you know the x is becoming large like that whole infinity thing?

**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?

**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 asy...

**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 ho...

**Chemistry**

Alright but since heat is released wouldn't it be negative? the H notation?

**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 ...

**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...

**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 ...

**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)...

**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 functio...

**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?

**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?

**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 becaus...

**maths**

(18/9(4-2)+5)

**Pre-Calculus**

-5x divided by x, how come that equals -5, but not -5x, how do the x's cancel out?

**Pre-Calculus need help in an Hour before test**

I still dont understand the whole process

**Pre-Calculus need help in an Hour before test**

The question in my book only has brackets around (x+5/2)

**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?

**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...

**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...

**Biology**

thanks a lot Ms. sue :)

**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...

**biology tutor on jiskha**

thank you this just like jiskha? free site?

**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?

**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.

**biology what is DNA**

why is DNA replication necessary to life?

**biology**

why DNA replication necessary to life?

**Biology- DNA**

why dna replication necessary to life? i think it because it carry genetic information?

**biology anyone..**

no im not sure. i dont know if i scale. and how?

**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.

**biology - What Am I?**

this is for plant cell is it chloroplast?

**biology**

this part of organism usually found underground, what organele conspicuously absent?

**easy math**

nevermind i get what i doing wrong.

**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?

**easy math**

thanks Ms. sue for helping =)

**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 fi...

**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?