Multiplying decimals:
First, multiply like a normal number.
64 × 37 = 2368
Add up the number of decimal points from your original numbers to find out where you should put the decimal point on your result.
6.4 has one decimal place, and -3.7 has one decimal place.
Our result should have two decimal places. (1+1)
23.68
Because we multiplied by a negative number, our result should be negative, too.
-23.68
12500mlx0.4=5000ml
12500-5000=7500ml
7500ml=7.5L







The first case occurs in

for

and

. Extending the domain to account for all real

, we have this happening for

and

, where

.
The second case occurs in

when

, and extending to all reals we have

for

, i.e. any even multiple of

.
The overall length would be 6in
-3x-6=-4x-9
x - 6 = -9
x = -3
y = -3(-3)-6= 9 - 6 = 3