Mathematics

Hi everyone Firstly, i'm at UNI doing this assignment, and stuck on this one part. Its only first year Engineering and it's a really easy engineering subject, probably don't need to go into this much detail but I suppose if i can then i may aswell do it We're doing a climate control system for a house in india, i've got an equation that somewhat models the outside maximum and outside minimum temperatures for the city the house is being built in... Tmax = 30 + 5sin(tπ/11) Tmin = 20 + 5sin(tπ/11) Where t = time in months (January = 0, December = 11) T = temperature Also, the rate of heat flow equation is ... Q/t = [kA(Thot - Tcold) ] / d Where…

Hi, I need to rearrange this equation to make x the subject. 6y = 9 - 3x So far I have added 3x to both sides 6y + 3x = 9 -3x + 3x Then I have cancelled the 3x"s on the right hand side 6y + 3x = 9 Here is where i become a little stuck, I assume that I need to divide the equation by 3 to give the final result x = 2y + 3 What I am unsure of is how to limk the previous two equations, any help would be appreciated, thanks.

hi every one, i am new member in this forum , & i wanna ask you question , it`s improtant for me, what is better mathematics science or math\computer science ? please , i need your help

I was reading up on pie and it sounded good to eat, no that was a bad joke. Ok, I was reading on pi and I was wondering if the reason people cant get an exact number, or something other then irrational is due to the shape of the circle. Such as a circle, or its circumference lacks a point, or is sort of always in a curve regardless of position in regards to circumference.

Can anyone suggest me a good book for comprehensive learning of different coordinate systems- namely-> 1. Cartesian 2. cylindrical 3. spherical 4. Radial 5. Curved Coordinate systems

Recently I had an idea of a function that I was interested in plotting after playing with my calculator. For some reason I feel it may have interesting properties and as it is based on the trigonometric funtion tan... it could be interesting extending it and start applying it to other geometric functions or series. Anyway, I will introduce my idea: Say you have f(x)=tan(x). Now, once you have a result you take the tan of your answer. Therefore you have; f(f(x))=tan(f(x)). This could then be continued and the "order" n of the function would be the independent variable. The order of the function above for example would be n=2, and for the one above it; 1. What I have be…

I'm trying to find out what is the best way to find the area of a circle w/o using pi or the formula for it.. any ideas??? i read something about polygons.. are there other methods?

How do you find the explicit formula of a degree higher then 4 using a matrix on the TI-83 calculator?

Hi everyone, I'm a little confused about positive & negative skewness. From what I've read, this is the picture I have, please tell me if it is correct: Positive Skewness This is when more data on a graph is towards the left of the graph (i.e. the lower values on horizontal axis). Even though the mass of the values are towards the left of the graph - the 'tail' is said to be greater on the right and the distribution is said to be right-skewed (if the majority of the data is on the left then wouldn't it make sense to think of the tail as being greater on the left and skewness to be left skewed?). Negative Skewness More data on a graph towards the right …

Hi everyone, I'm drawing a cumulative frequency table & graph for coursework on different lengths of words between an newspaper and magazine. I've read in my study guide that data must by grouped before it can be processed into a cumulative frequency table and graph. I understand the reason for this when the range of data is large - but my data ranges from 1 letter to the biggest word I found with 15 letters. Must I group this relatively small data set if I want to plot a frequency graph? Will I get lower marks if I don't? I could plot it in 5 groups of 3 letters - but I don't see the point of this considering that 1 - 15 isn't that large. I'd be grateful to k…

I'm at the end of high school, and I want to pursue engineering, maybe mechanical or *maybe* aerospace/aeronautics. I have heard that they physics isn't that hard, but the math is HECK OF. I heard that some equations are like LONG @$$, like 12 foot long when the professor writes them on the board. I need to look at some real examples of this kind of stuff, see if it freaks me out. Anyone how has some equations that sound like that, paste 'em in. I'm not the math whiz kind of person, I can understand anything we're doing in math class, maybe not the first time around, but when I do a couple of problems I get the hang pretty quickly. Any suggestions also appreciate…

Hey there.... How does one solve this determinant? 10 -10 0 0 -10 17 -2 -5 0 -2 7 -1 0 -5 -1 26 Since the lines arent coming straight.... Row #1: 10, -10, 0, 0 Row #2: -10, 17, -2, -5 Row #3: 0, -2, 7, -1 Row #4: 0, -5, -1, 26 How do i solve this?

Hi guys, Its my first post here, and I'm setting up some goals, so I was hoping I could get a few mathematics experts set me up with some helpful tips on making this journey in advanced math a success. Allow me a little extra length on my first post here in the maths forums: A while ago I started pursuing one of my larger life goals to learn the more advanced maths. Then I burnt out for perhaps a number of reasons, but lack of motivation was not one...the biggest was simply that I grinded to a hault because of a strange thing I experienced: Thinking I was understanding the rules on the level of algebra, but for some reason, never getting certain problems right a…

Hi, My name is Aimee and I have a question about volume.... basically how do you work it out? If you have two differnet objects then how would you work out the difference (in %) of volume between the two??? Thanks Aimee

This was an idea that i came up with during a math class, where we were learning about perpendicular lines. The way to prove/solve perpendicular lines is by multiplying the gradient of the first line by the second gradient and the answer will be -1. So i had the though that a flat horizontal line has a gradient of 0, and a perfectly vertical line is described as "undifined". Now because the line is undifined i thought that would mean it can be described as infinity. So that would mean that 0 (flat line) multiplied by infinity (vertical line) equals -1. Tell me what you think.

This is a concept that has bothered the hell out of me for years. How can anything be infinite? It seems that everything should logically have an end, yet so many of the concepts used in math and science involve thinking that there are certain things which will never end. Zeno's paradox is a prime example. I'm sure everyone is familiar with Zeno's paradox and the many forms it has taken, but I'll give a brief summary of it if anyone is unfamiliar with it. You start walking towards a wall, and stop at the halfway point. From that point you walk halfway to the wall again, and stop. From that point you walk halfway to the wall and stop again...I think you can see where …

Can someone explain to me why x^2=49, the value for x is plus or minus 7

Hi everybody, I have been playing a little with prime numbers and got this nice approximation of pn (distribution of prime numbers): Function. It uses the Feigenbaum constants (chaos theory) and a decimal logarithm. This is the plotted function I would like to know if there is any recognized approximation of pn. Thanks in advance.

Greetings: I am a first time user of this web site, so, Imay make a few mistakes. I want to re-learn the formula for determining the diagonal distance between the ends of a 3-4-5 right triangle. The the known measurements are 10 ft and 12 ft.

g=( L((aX)+(bY)) / (X+Y+1) could anyone solve for X, Y, while G>0 ? I use this formula everyday and would love to be able to use it like... aX,bY = ????? I once plotted it , and all of it's transpositions, I just caan't finsh it off!! ... I can't find a correlative formula for aX <> bY

Hi everyone, Can I just check with you, is 0.1M 10%? So to get from molar to % we just multiply by 100? Is that correct? thanks in advance...and sorry forthe simplicity

please i need your help to solving this problem :

What is: 4+root(6)/ root(48)? I got 4+3 root(2)/12 is that rite?

I need help with this problem, it is very confusing to me, can anyone help, and explain how to? Thanks. http://img186.imageshack.us/img186/3112/gfgfgyc6.jpg And another problem, very related to this one is this. http://img241.imageshack.us/img241/7311/anotherproblemol7.jpg

i had a question on how substitution works exactly. i know that the dervitive of the sub. needs to be infront. but what if its not? lets take an example. x^2 sqrt(x^3 +1) here you would make x^3 + 1 = u and du would be 3x^2 but you have only x^2 infront would'nt dividing by 3 change it? what if for example you only had x infront? maybe im just confused *sighs*