Answer 1

https://www.sololearn.com/discuss/1812390/?ref=app

Answer 2

To keep the Q/A more clean, please use the search bar before posting. Thanks 😉
Also avoid multiple threads with the same question in short time.

https://www.sololearn.com/discuss/1349534/?ref=app
https://www.sololearn.com/discuss/1341908/?ref=app
https://www.sololearn.com/discuss/1197006/?ref=app
https://www.sololearn.com/discuss/1554953/?ref=app

You can also read about main rules here:

https://www.sololearn.com/discuss/1316935/?ref=app