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The first set has no solutions (Multiply the second equation by -5 and you get 2x -5y = -3/2 which cannot hold at the same time as 2x - 5y = 3)

I entered the wrong data in the matrix approach!  But since that approach isn't one you understand, here's how to do it by a process of elimination:

nevermind i got it

17) is c.

I think all the others have been answered.

Thank you alan ... waiting for remaining questions 

3c^2 = 5c   Rewrite as  3c^2 - 5c = 0  The left-hand side factors as  c*(3c - 5)

10x^2 + 9x + 2 = 0   The LHS factors as (2x + 1)*(5x + 2)

9y^2 + 16 = -24y  Rewrite as 9y^2 + 24y + 16 = 0  The LHS factors as (3y + 4)^2

4m^2 = 25  Rewrite as 4m^2 - 25 = 0   The LHS is the difference between two squares, so: (2m + 5)*(2m - 5)

The term "googol" was coined in 1938 by 9-year-old Milton Sirotta, nephew of Edward Kasner - see the book Mathematics and the Imagination by Kasner and Newman.  (It's a good book - published in 1940, it's still worth reading today.)

sin(pi/12 + pi/2) = sin(pi/12 + 6pi/12) = sin(7pi/12) = 0.9659258262890682867497431997289

 (numerical result copied from the Microsoft Windows calculator!)

Take logs of both sides

log(3^x) = log(49)

x*log(3) = log(49)

x = log(49)/log(3)

$${\mathtt{x}} = {\frac{{log}_{10}\left({\mathtt{49}}\right)}{{log}_{10}\left({\mathtt{3}}\right)}} \Rightarrow {\mathtt{x}} = {\mathtt{3.542\: \!487\: \!498\: \!322\: \!844\: \!4}}$$

Because 2=4-2, 4=2+2 and 0=4-2-2! :D

i cant understand your question!is it some high class math? or just nothing!

Woah!i had never heard of this term , and now im so shocked that even these kind of numbers exist in the world!thanks Alan for telling me what these r!

thumbs up!!!

And i forgot one thing, we have to open brackets also on the first step!

For question 5) the average velocity is (x(4secs) - x(2secs))/(4secs - 2secs)

This is (5 - 10)/(4 - 2) = -5/2 = -2.5 m/s

So b is the correct answer.

So we would do this like

64 + (-80) -2   

= 64 - 80 -2  ( out here we have put minus sign in 64+(-80)  becoz plus minus is equal to minus , if u still dont get it then i mean if there is a plus and a minus sign we would choose minus sign so now we will  solve this by steps)

= -16 -2    ( out here we had subtracted 64 and 80 but now we will add -16 and -2 as there are two minus signs here so we will have to do addition and also we will add minus sign to the answer)

= -18    ANSWER

i hope u have understood by now but if not then pls be free to ask!

i hope this helps!

for 19 .... also now its very clear 

oh okay!

yeah off-topic sounds a lil.............umm....................informal!and fun sounds enjoying!

i think you are looking for a nice easy to understand explaination!so for you i have a site which can tell u very easily what mean is!heres the link!

I do not understand this question.  

mean is just another word for average.

add up all the numbers then divide by how many there are.  

I don't know question 17 sorry.

No Rosala I do not think that they will be deleted.  

Before I could categorise a thread as 'fun'  now it has gone.  It is just a category like "mathematics" or "Physics"

Now the only general one is "Off  Topic" which I don't intend to use very often because it doesn't sound very nice.   

Melody did admin remove the fun category!are all funny posts going to be deleted???

thats really a great post DragonSlayer!i would give you a point for that!

And for new users, always be free to ask a question or clear your doubts!

for 16 .. Now its very clear  thank you 

Question 19

NOTE:    I do not know this stuff.  I am referencing this site