Answers

2015-07-23T21:49:48+08:00
13/4...................................
1 5 1
lol.. So opposite number is just the counterpart?
yup
lol... I guess I still need to go back to Elementary. XD I must have missed tons of these.
haha
2015-07-26T06:39:35+08:00
13 is prime number and 4 is composite number.
0