Tuesday

October 21, 2014

October 21, 2014

Total # Posts: 110

**Science**

MgO (Magnesium Oxide)?
*January 8, 2009*

**psy**

Is this some kind of survey and you're gathing data from people's responses? ---Well, you'll have to do some research on your career path. Ex: If you are a science major, you better take lot of biology, chemistry, biochemistry, genetics classes and of course lot of...
*December 15, 2008*

**physiology**

Um... it uses dendrite to receive signals (inputs) from many other cells because dendrite has many branches of nerve endings. Axons are joined to the dendrite from the head body so the information (message) can be facilitated to the head body. This is what I think, at least.
*December 11, 2008*

**Ratio**

Translate these info into equations: y=3/5x x=5/3y y+140=2x Now you can use substitution method to solve for x easily.
*November 28, 2008*

**crt 205**

Okay? I believe I don't see any data or question anywhere here except your little introduction.
*August 17, 2008*

**chemistry**

Combustion?
*July 17, 2008*

**Math**

Ex: 1^(1/2) = square root of 2 of(1^1) = sqrt (1) = 1 Ex: 2^(3/2) = sqrt of 2 of (2^3) = sqrt (8) = 2 sqrt(2) Basically do the exponent normally for the numerator and do a square root of the denominator number.
*July 2, 2008*

**algebra**

Don't know. Can I suggest you open up your book and look at the application problems section on the polynomial chapter? Those word problems should have real life cases.
*May 19, 2008*

**chem**

Okay, this is what I think... it seems to be too easy. So the reaction produces 6 moles of CO2 and 6 moles of H2O, that mean they have a ratio of 1 to 1. In other word, when you have 174 moles of H2O, then you'll also have 174 moles of CO2... so there isn't really any ...
*May 16, 2008*

**Anatomy**

In humans, melanin is the primary determinant of human skin color. So if you are tanned, maybe that's why.
*May 5, 2008*

**science**

You probably want to look at topics like the evolution of whales... good luck searching! I think their legs turn into the anal fins and the hands turn into the pectoral fins and they need fins to adapt to their new oceanic environment. They probably go to water because they ...
*April 16, 2008*

**chemistry**

I haven't done this in years... but looks like you can do this using the formula PV = nRT if I remember correctly where P = pressure in atm, V = volume in L, n = number of moles, R = 0.0821 (atm*L*K)/mol "I'm not so sure about the unit on R", and T = ...
*April 16, 2008*

**maths**

The way you put it, there's no multiplication... so I don't know where you get 3p and 2p... maybe you want to revise your original problem by addiing in the parentheses. Anyway, by the way you put it... it should be: p-p-1/2-2/3=1 (combine like-terms) 0-3/6-4/6=1 (...
*April 16, 2008*

**algebra**

Total cookies baked = 2*20 + 10 = 50 cookies 50x = 797.30 x= $15.95/cookie... wow that's expensive! Okay... this is actually the equation of how much each cookie cost and assuming that the bakery sold all 50 cookies. This is not how many cookies sold... I don't think ...
*April 3, 2008*

**Algebra**

Try to multiply first equation by 3 and second equation by 2. You will end up with 6x and -6x, you can eliminate those and then use the substitution method to find y.
*March 28, 2008*

**algebra**

First, convert your equations to y=mx+b form and then you can graph each of them into your graph individually. Where the two lines intersect, that's your answer.
*March 14, 2008*

**math**

9, 18 and 27
*March 13, 2008*

**Math**

I believe all these properties can be found easily just by typing it in the google search box... Example, I pasted this exactly as it is from a site I found: Associative Property of Multiplication The property which states that for all real numbers a, b, and c, their product ...
*March 13, 2008*

**Algebra 1**

1 and 31 because it is a prime #?
*March 13, 2008*

**Math**

You sure you have it the right way (1 in = 0.01 in.) and not the other way around? The way you say it, Lin actually has to draw 100 times bigger than the actual size of the computer diode... usually when you drawing a miniature, you are drawing with the picture smaller than ...
*March 13, 2008*

**math**

Ex: 1 2/3 Numerator = 1x3+2=5 Keep Denominator Answer: 5/3
*March 11, 2008*

**Math(factoring)**

6(y^2-4) 6(y-2)(y+2)...
*February 29, 2008*

**biochemistry**

LDH catalyzes the reaction between pyruvate and lactate. Pyruvate is important because it involves in glycolysis (glucose metabolism). Lactate is important because you can use lactate to quickly generate the energy you need during intensive exercising. Hope this helps!
*February 29, 2008*

**Chemistry**

I just know that in order to be a ketone, this functional group looks like this C-C(O)-C so it must have at least 3 carbons to be a ketone... I don't know if you have to explain using eletronegativity or dipole...
*February 16, 2008*

**geometry**

Um... I can't understand what you are trying to say. Please add the commas and periods to make it easier to read... maybe someone else can understand, but not me. Just pointing that out in case someone else has the same problem as me, no offense.
*February 11, 2008*

**chemistry**

I vote for bent.
*February 11, 2008*

**chemistry**

1g = 100 cg --> 0.25g x 100cg/g = 25 cg 1mL = 1 cm^3, 1L = 1000mL, you figure the rest out. 1 m = 100 cm, 1 m^2 = (100 cm)^2 = 10,000 cm^2, you figure the rest out. Good luck!
*February 11, 2008*

**chemistry**

D --> London's dispersion force.
*February 11, 2008*

**Physical Science**

1) Find the volume: V = (4/3)(pi)(r^3) 2) Density = mass/volume There you go... that's all, 2 steps!
*February 3, 2008*

**Chemistry**

I haven't done chemistry for a while, but here's my best guess: M = mol/L so 0.120 M means there is 0.12 moles of Ca(NO3)2 in a liter. The question ask for 500 mL, which is half of a litter, so I would just divide 0.12 by two and get 0.06 moles of Ca(NO3)2 in 500 mL. ...
*February 3, 2008*

**Algebra**

.. 3sqrt6 and sqrt2a^4? So you simplified the problem first as I said above and you get: 3(a^3)sqrt(2a) * 3(a^4)(b^3)sqrt(3) and then you multiply those 2 things together and you get: 9(a^7)(b^3)sqrt(6a)
*February 3, 2008*

**Algebra**

Plug your 0 into the x in your equation and you get 1 = -1, which is false, which mean: no, the answer is not x = 0. Since you didn't show your work, I have no idea what you did wrong on your process... or maybe you just guess 0 and didn't do any work at all. But I'...
*February 3, 2008*

**Algebra**

... 3sqrt6 and sqrt2a^4? So you simplified the problem first as I said above and you get: 3(a^3)sqrt(2a) * 3(a^4)(b^3)sqrt(3) and then you multiply those 2 things together and you get: 9(a^7)(b^3)sqrt(6a)
*February 3, 2008*

**Algebra**

18 = 9 * 2 then sqrt 18 = 3sqrt2 sqrt a^7 = a^3 * sqrt a 27 = 9 * 3 then sqrt 27 = 3 sqrt3 sqrt a^8 = a^4 sqrt b^6 = b^3 Now just multiply the like-terms together.
*February 3, 2008*

**chemistry**

One to two
*January 31, 2008*

**Chemistry**

I meant, I was wondering that too, so thanks even though it isn't my question.
*January 30, 2008*

**Chemistry**

Alright thanks!
*January 30, 2008*

**Biology**

A base pairs with T, G with C. In RNA, A pairs with U and G pairs with C. I think you just need to do some more readings... most of these can be answered in your book or note for sure.
*January 29, 2008*

**biology**

DNA is double stranded. It splited out into two single strand and produce another new strand and that created more DNA. Next, the DNA sequences are translated into amino acids. For every 3 base sequences, that would represent a single amino acid. There are specific sequences ...
*January 29, 2008*

**Maths**

1. 10-99 are two digits # and that mean there are 99-10+1=90 possible numbers (and of course they're all less than 100). and so from 45-90, there are 46 numbers. 2. a and b looks right. There are 9 different letters in the word PROBABILITY so it should be 9/26. 3. Count ...
*January 28, 2008*

**biology**

DNA is double strand, during transcription, they (the parents or original strands) separate into two single strands. Then the new strand will attach to each of the parent strand and form a new DNA molecule and because this new molecule consist half the parent and half the new ...
*January 28, 2008*

**Algebra II**

1. y=kx plug in your # and solve for k 2. y=k/x solve for k and then plug in your y=4 to find x with the k value you found. 3. I forgot how to do this one.. it's been years lol.
*January 28, 2008*

**algebra**

Step one: combine like-term - put all the x on one side and all the whole number on the other side by addition/subtraction. Step two: get x on one side by division/multiplication. Ex: 3x+5=2x-3 Subtract 2x and -5 on each side of the equation 3x-2x + 5-5 = 2x-2x - 3-5 x = -8
*January 27, 2008*

**Science**

I did this experiment in my science class while I was in middle school: Fill a glass with water and then put a piece of cardboard on top of it and then slowly turn the cup upside down and ta-da, the cardboard will be able to hold the water from leaking out. Okay, empty the ...
*January 27, 2008*

**general**

x-ray? Lol
*January 27, 2008*

**math**

On the step where you say y=-4y is where the problem is. Re-check that part and do it again. Everything else seems right except that you are not doing what the problem is trying to tell you to do. You are supposed to solve by graphing, but here, you are doing substitution.
*January 26, 2008*

**physics**

ummm... your body gives off heat and warm up the air and the warm air just circulate around your body inside your cloth to keep you warm?
*January 24, 2008*

**advanced fuctions**

I haven't done log for a while, but can't you just use subsitution and set up an equation like this? log(x-2)=1-log(x+1) and then solve for x? log(x-2)+log(x+1)=1 and I think there's a rule that let you combine those... like multiplying them or something and go ...
*January 24, 2008*

**science**

I thought constant and control are the same thing. Something that you keep constant, which mean you don't change it. The opposite of that would be a variable, which mean it changes and usually that's what you're testing for.
*January 23, 2008*

**Algebra**

1) Distribute ex: 2(5+x) = 2*5 + 2*x = 10 +2x 2)Combine like-term 3)Solve for h
*January 22, 2008*

**Algebra**

(y-1)(y-6)/ (y+9)(y-1) No... you factor out and then the (y-1) cancel off and you'll end up with y-6/ y+9
*January 22, 2008*

**algebra 2**

A. Find the slope (rise/run). Plug x and y into your equation with the slope to find the y-intercept and then you'll have your y=mx+b equation. B. Should look like a "V" shape open upward starting at the vertex at (0,0). Basically "x" can be any number ...
*January 17, 2008*

**Geometry**

90 + (x-25) + (x+25) + (x-30) = 360 90 + x - 25 + x +25 + x - 30 = 360 60 + 3x = 360 3x = 300 x = 100 The concept of this problem is to recognize that ANY QUADRILATERAL (square, trapazoid, rhombus, rectangle...etc) have a total angle of 360 degrees, so you add them all up and ...
*January 17, 2008*

**physics**

16F=mg Solve for m. m*2.2 = weight in lb.
*January 17, 2008*

**MATH**

I always put the equation in the slope y-intercept form when I worked on these equations... some other people prefer other forms, which also works. However, I'll just show you my way since I know it best. So the form we want to translate to looks like this: y = m*x + b ...
*January 16, 2008*

**MATH**

I suppose you are missing the "x" in your functions. Just graph it as you normally would, which mean graph y = (-3/2)x + 8. Then pick on any coordinate point that's NOT on the line for testing, just FYI, I always use the point (0,0) just because it makes the math...
*January 16, 2008*

**biochemistry**

1) There's no way to do this without knowing the volume of the myocyte, so I would recommend you to search the book or your notes, should be somewhere in there. Basically, you would approach this question by finding the volume of the actin molecule first. V = 4/3*pi*(1.8nm...
*January 16, 2008*

**algebra**

Good job! Sorry I posted the same thing twice because my net froze.
*January 15, 2008*

**algebra**

Well... as you said, you get v^16... so would it be 9+7=16 or 9*7=16?
*January 15, 2008*

**math**

Is your submarine rectangular? If so, just multiply the two numbers... I can hardly imagine you would have to do calculus with the information given for a more accurate area of the submarine's actual shape.
*January 14, 2008*

**PHYSICAL SCIENCE**

Looks like it's D, but B is quite goofy. If they mean the mass of the elements in the reactant side only, then I think it's true, of course that also including the number of moles of each element in the balanced equation. Just a side note, in a real world, D is never ...
*January 14, 2008*

**Science**

Let's see if this will help you visualize what Bob said: * = 1 valence electron H = Hydrogen There are 2 hydrogens atoms: H* and H* And they (the atoms) form a covalent bond by sharing the electrons: H**H --> now each hydrogen is much happier with 2 valence electrons ...
*January 13, 2008*

**Algebra**

8<w+3<10 8-3<w<10-3 5<w<7 Your answer should be (5,7) --> this mean any numbers between 5 to 7 except 5 to 7 themselves.
*January 13, 2008*

**Algebra 2**

Oh, and now you said you are at 56.7% I can give a rough prediction with the if...then statements for you, that way you don't have to ask your teacher and dig out all your tests to tell me the results and stuffs. If you do not do anything different than what you did thus ...
*January 13, 2008*

**Algebra 2**

I don't think anyone of us can give you that answer without knowing the method of how your teacher keep tracks of score. For example, does your teacher treat all points weight equally? This is when 1 point in a test is equal to 1 point in the assignments and everything ...
*January 13, 2008*

**Math**

Your question has already been answered... check your previous posting before you post another one please.
*January 13, 2008*

**Math...**

9 and 15 are the numerators 12 and ? are the denominators Start the problem by setting up an equation by multiplying the numerators with the denominators like this: 9 x ? = 12 x 15 Now just solve for ?
*January 13, 2008*

**Math**

-6t=12 t= ?
*January 13, 2008*

**Geomety**

Let me first convert them into the same y = mx + b form: -->y = -(3/4)x - 1 -->y = -(3/4)x + 5 Okay, slopes are the same so you know they're parallel to each other. Looking at the y-intercept you know that one has a coordinate of (0,-1) and the other has a coordinate...
*January 13, 2008*

**algebra**

Where is the /x comes from on your x^2+2x/x... you were /2 up there on the above step... and even if the problem is f(2)/x... your f(2) = 0, that mean you get 0/x which equals 0, thus leaving you only x^2+2x on the left side, which equals x(x+2). Basically, I disagree with ...
*January 13, 2008*

**algebra**

Hmm... that should be the same answer because f(2) = 0 and 0 divide by any number is 0 and "x" cannot be zero.
*January 13, 2008*

**algebra**

=[(x+2)^2 - 2(x+2)] - [(2)^2 - 2(2)]/2 =x^2+4x+4 - 2x-4 - (4-4)/2 =x^2+2x - 0 =x(x+2) = 0 or -2 I have the x+2 part of your "correct answer", but I also got the "x" in there. That's the answer I came up with, if you don't understand how I arrive my ...
*January 13, 2008*

**Algebra- functions**

When you put the function into your graphing calculator, just make sure you can see the whole window so you can see all the turns. Whenever you see your graph intersects with the x-axis, you have 1 zero... so just go ahead and count how many times it intersects the x-axis. For...
*January 13, 2008*

**Math HELP please**

sq24 = sq4 x sq6 = 2 x sq6 sq = square root of
*January 13, 2008*

**Math**

Can you type out the problem? Maybe then people can actually help you. By reading what you said it sounds like it's sq (x^2/x-6) = 0... but I guess that's not what the problem looks like, be sure you indicate where the parentheses are in your problem.
*January 13, 2008*

**math**

Yeah, half of 66 is 33.
*January 12, 2008*

**Why Jiskha Is Full of Crap**

Even I got my biology degree, I don't feel like I know most of the questions posted here. I just don't want to give a guess as an answer so I usually choose not to answer them. However, if I encountered questions that I know how to deal with, I will answer them for you...
*January 12, 2008*

**Math**

Um... I thought any non-whole number is considered a prime number so I say yes.
*January 10, 2008*

**science**

Lol! Capillaries?
*January 10, 2008*

**geomotry**

...find the slope? I'm not sure what you don't understand here. I mean, the vertex coordinates are given on the diagram right? Then it's easy. Just find the slope on each side and if the slope on both sides are the same then that proved they're parallel and ...
*January 9, 2008*

**Math is this right**

Yeah, I think you get the idea. I just want to make sure your answer mean I/(Pr)=t not (I/P)r = t. Again, I think you got it right, but the way you typed your answer on the computer makes it look like (I/P)r = t, which is wrong.
*January 7, 2008*

**ALEGEBRA**

2=2x+4 -2=2x -1=x One solution?... if I read the question correctly.
*January 7, 2008*

**Chemistry**

Fe2O3 + 3CO --> 2Fe + 3CO2 This one is difficult, took me about 10 minutes, but it's pretty simple in a way that you just plug in number and do trial and errors...
*January 6, 2008*

**Chemistry**

The number of all the elements on the left side of the equation are equal to the number of the corresponding elements on the right side of the equation, thus no additional or less atoms are created nor destroyed. For example, in this carbonic acid reaction where hemoglobin ...
*January 6, 2008*

**chemistry**

aqueous solution.
*January 6, 2008*

**ap biology**

Not sure... but if I have to guess, I'd say positive directional selection because 5 or 6 eggs seem like a big number. Positive directional selection favors those have higher trait values, in this case, they produce more eggs, thus have higher fitness than other Starlings ...
*January 6, 2008*

**Chemistry - Titrations**

Distill water has pH = 7 and NaOH is a strong base (pH > 7)... if you mix NaOH with water, it will neutralize some of the base (decrease the pH to be closer to 7) and thus contaminate the NaOH solution.
*January 5, 2008*

**science**

Introduction, hypothesis, data, result, conclusion.
*January 5, 2008*

**ap biology again**

Yeah, that's a bit confusing. Here is what I think they're trying to say: -Because unmethylated bacteriophages will be degraded by the restriction enzymes found in bacteria, natural selection will favor those bacteriophages that have methylated DNA sequences (which ...
*January 4, 2008*

**General**

Hehe, I didn't have to take ACT or SAT or anything while I was in high school. I don't know this is an option in any other states, but in Minnesota, we have a Post Secondary Program (PSEO) where you can attend college during your junior and senior years so you can earn...
*January 2, 2008*

**Biology**

All organisms are constantly evolving. What they evolve to or what trait or characteristic they will develop in the future is uncertain and hard to predict in most cases. However, according to Darwin, in short-term evolution, we can predict that organisms lower in fitness will...
*January 2, 2008*

**ib math studies**

I'm not sure what you meant by mathematical processes... but maybe measuring their velocities and times and then do a calculation on their accelerations? You can also apply math to find out their gasoline utilization efficiency. Measure how far a car can go (distance) ...
*December 31, 2007*

**physics**

Small sedan will experience a larger force because the truck is heavier (more mass and more momentum if they both travel at equal velocity) so it's not going to move much from the collision.
*December 20, 2007*

**Algebra**

x^2 - 4 = 2x-10 x^2-2x+6 = 0 There you go... solve by factor or that quadratic formula.
*December 20, 2007*

**math**

The word "line" is vague... you need to be specific. A line can be a segment, which has an end or a ray which never ends. Hope I answered your question.
*December 12, 2007*

**Algebra**

0.15x=230 Transferring into words: 15% of the original price is equal to 230 dollars.
*December 10, 2007*

**Parabola/Hyperbola**

Not really for homework help, but just for curiousity. Is there a way to distinguish whether the graph is a parabola or a hyperbola if you do not know the equations and one side of the hyperbola is missing (so there's just one U shape) by restricting the domains or ranges...
*November 29, 2007*

**Math**

divide pi and r^2 on both sides of the equation.
*November 29, 2007*

**Chemistry**

Wavelength is the length from one crest (peak) of the wave to the next crest or from one trough (the bottom peak) to the next trough. Amplitude is the height of the wave, not the length. There's not necessary a relationship between wavelength and amplitude. Wavelength is ...
*November 28, 2007*