# Math Help - negative numbers

1. ## negative numbers

if i had -2x-6 ut would be +12 right?

2. Originally Posted by Arexsis
if i had -2x-6 ut would be +12 right?

yes

$(-2) \times (-6) = +12
$

3. ## explain

Hi,
can anyone tell me that why is pie value 22/7?
and why 0 came when we devide any interger to 0
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medium format digital general dentistry raleigh

4. Originally Posted by mack
Hi,
can anyone tell me that why is pie value 22/7?
and why 0 came when we devide any interger to 0
____________________________________________
medium format digital general dentistry raleigh
$\pi = 3.14159 \approx \frac {22}{7} \approx \frac{355}{113}$

5. Originally Posted by mack
Hi,
why 0 came when we devide any interger to 0
____________________________________________
medium format digital general dentistry raleigh
$
\frac{0}{\text{any number}}=0$

6. Originally Posted by mack
Hi,
can anyone tell me that why is pie value 22/7?
Strictly speaking, pi is NOT 22/7 but it is close. pi is, according to the calculator that comes with MicroSoft Windows, 3.1415926535897932384626433832795 while 22/7 is 3.1428571428571428571428571428571.

Neither of those is exactly equal to pi but the first is correct to 31 decimal places and 22/7 is correct to 3 decimal places.

and why 0 came when we devide any interger to 0
____________________________________________
medium format digital general dentistry raleigh
I assume that "divide any integer to 0" means "divide any integer BY 0".

Division is the "reverse" of multiplication. Saying that "a/b= c" means "a= bc". If a= 0 then bc must equal 0. As long as b itself is not 0 the only way we can have bc= 0 is if c= 0: 0/a= 0.

Warning: notice requirement "As long as b itself is not 0". If b were equal to 0, then bc would be 0 no matter what we took c to be: we would not get any one answer for 0/0! It is not true that "0 divided by anything is 0". "0 divided by 0" is not ANYTHING- we cannot divide BY 0.