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+1313

Bump

StuFeb 23, 2014

+1313

What's harder to gain a thorough understanding of while under time constraints: Calculus or Vectors in Engineering?

StuFeb 23, 2014

#47

+118725

+11

Hello all,
Great answers were given today by Princess Sophie E, guest, Kitty<3, ezom, Rom and ILS.
Thank you also for your contribution ItsFringeHelper.
There was also nice thank you from a guest. It is always nice when people show their appreciation.
Ezom and ItsFringeHelper only just signed up today. Welcome to Web2.0calc forum. We hope that you enjoy your time with us.

Please be wary if you are guided to other sites by unfamiliar people as it may not be what you expect or what you want. If the site is deemed offensive the post will be reported but it is better for most of you to ignore these posts.

That is it for tonight, enjoy the rest of your weekend.
Melody.

MelodyFeb 23, 2014

+118725

Hi mathybelle,
Sqrt(1003) is an irrational number.
This is because 1003 is not a square number.
There a also no square numbers that factor into 1003 so sqrt(1003) cannot be simplified.
Kitty has given you a very good approximation.
Irrational numbers cannot be written as fractions or as terminating or recuring decimals so if you want an exact answer you will have to leave it as sqrt(1003)

Hi Kitty,
Try hitting the math button located about the smilies. Enter 'sqrt(1003)' where the curser has been placed, then move the curser to the end of the line and press enter. (you can add an = sign if you want it will make no difference)
This is the output that you will get. Try giving it a go.

sqrt(1003)

MelodyFeb 23, 2014

+118725

Guest:
solve the following system by elimination.
1/3x+1/2y=-3
1/3x+3y=-13

That was a great answer ezom
I just noticed that both equations begin with 1/3x so if you start by subtracting the second equation from the first equation it might be quicker.

1/3x - 1/3x +1/2y - 3y = -3 - - 13
0.5y - 3y = -3 + 13
-2.5y = 10
y = 10/-2.5 = -4

1/3x + 1/2*-4 = -3
1/3x - 2 = -3
1/3x = -1
x = -3
solution (-3,-4)
It doesn't make much difference, it is just a slightly different approach.

MelodyFeb 23, 2014

+118725

Thanks guest and Kitty,

I would consider (3j+9)/2 to be the best answer

I think factorising and simplifying are opposite things so I don't think that the 3 should be factored out.
However, if anyone has anything to add, I would like to hear your thoughts.

MelodyFeb 23, 2014

+118725

That was an interesting one. I would never have guessed it either. Thanks ILS
Thanks for the site too.

MelodyFeb 23, 2014

+6252

wouldn't have guessed that one in a million years. Thanks Serena

RomFeb 23, 2014

+135

hscr:
Here is a sequence of 3 numbers:
13
202
2626

What is the next number in the sequence?

The OEIS lists it as the powers of 10 written in base 7.

https://oeis.org/search?q=13%2C202%2C2626

In that case the next number is 41104.

I like SerenaFeb 23, 2014

Rom, this is not the correct answer. I don't recognize your answer as any type of number that would suggest a logical sequence.

hscr

GuestFeb 23, 2014

Please use only Math questions here!
Thank you,
- Fringe

ItsFringeHelperFeb 23, 2014

+5478

You can use the calculator on this site for that: http://web2.0calc.com/

The answer is 31.6701752442262308
Rounded to the thousandths is 31.670

kitty<3Feb 23, 2014

ezom:
002.jpg

Thank you

GuestFeb 23, 2014

+6252

If one asks what is sqrt(-16) over the real numbers the correct answer is that it does not exist.

If one asks what is sqrt(-16) over the complex numbers the answer is 4i

RomFeb 23, 2014

sqrt16 sqrt -1 = 4i

sqrt of -1 is imaginary number by definition

ezomFeb 23, 2014

002.jpg

ezomFeb 23, 2014

Feb 22, 2014

+5478

Princess Sophie E:
TheMathNoobster wrote: What is 1+1? i never have seemed to crack this one, its a real toughie.

Have you heard of the machine called a calculator, try using it.

Lol, I'm pretty sure that requires using the thing called the brain. It is a very fascinating thing that many people possess.

kitty<3Feb 22, 2014

+5478

18 (j+3) / 12

First distribute the 18 by multiplying it out:
18*j + 18*3 / 12

That would be 18j + 54 / 12
You can take the Greatest Common Factor of 18, 54, and 12 out, as a factor. The GCF would be 6.
So that would be:
6(3j + 9) / 6(2)
Now you can take the 6 out from the top and bottom, since it cancels out.
(3j + 9) / 2
That could also be factored as 3(j + 3) / 2

Guest's answer is also right. It is another way of writing it, and is probably more simplified than my answer. Thank you Guest:)

kitty<3Feb 22, 2014

18 (j+3) / 12
Original
18j+54/12
distributive property
3j/2+9/2
separating and simplifying fractions

GuestFeb 22, 2014

+72

TheMathNoobster wrote: What is 1+1? i never have seemed to crack this one, its a real toughie.

Have you heard of the machine called a calculator, try using it.

Princess Sophie EFeb 22, 2014

+72

happyfeet wrote: what is the answer to the square root of -16?

The square root of a negative number does not exist.
So square root of -16=undefined.

Princess Sophie EFeb 22, 2014

+72

adsfafsd wrote:14+s=16

14+s=16
s=16-14
s=2

Princess Sophie EFeb 22, 2014

GuestFeb 22, 2014

#46

+118725

+14

Hello everyone,
This was a very quiet Fri/Sat which is perfectly normal and understandable. Even the most academic amount us do not want to do homework on a Friday night.
There were some great answers from Princess Sophie E, I like Serena, Spoonify & Rom, Kitty<3 and sp3ctr3. Thank you all.
There was also a nice thank you from Hayden. Good manners are always appreciated.
Goodnight all,
Enjoy your Sat/Sun.
Melody.

MelodyFeb 22, 2014

+118725

Hayden:
thank you very much my exams are coming for year 6 a very big exam so i had a practice paper
im 11 turning 12 and i am a girl

You are very welcome Hayden. Best of luck for you big exam.

MelodyFeb 22, 2014

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