Melody

Are you happy with the answer now Rosala?  You have a few to choose from.   

Maybe

Chris is teaching me the science of forensic mathematics  - How did I do Chris?     LOL

$$\\a_n=(n+1)/(2n+3)\\\\
a_n-a_{n-1}=1/99\\\\
so\\\\
a_{n-1}=(n-1+1)/(2(n-1)+3)\\\\
a_{n-1}=n/(2n+1)\\\\
so\\\\
a_n-a_{n-1}=1/99\\\\
\frac{n+1}{2n+3}-\frac{n}{2n+1}=\frac{1}{99}\\\\
99(n+1)(2n+1)-99n(2n+3)=(2n+3)(2n+1)\\\\
etc$$

If you want me to continue, just ask.    

Thanks Gino  

If x>=1 then it is x-1

If x<1 then it is 1-x

0.6hzm  

that is the answer

quotient means divide

137/4

now the calc is on the home page.  

Thank you, I am glad that you like it.  :)

1000000*5*19-189

you can do this on the calc on the home page.  :)

NOT ME  

4/7x - 2/7y = 6/7, (1a)    and  2/5y - 3/5x = -6/5   (2a)

Multiply both sides of (1a) by 7  and    multiply both sides of (2a) by 5

4x-2y=6    (1b)         and        2y-3x=-6     (2b)

-3x+2y=-6    (2b)

(1a)+(2b)

4x-3x-2y+2y=6+-6

x=0

Sub into (1b)

-3*0+2y=-6

0+2y=-6

y=-3

SO         x=0,     y=-3