Question

fan+medal

Answer 1

H=2ab/a+b

Answer 2

@javyb13
Please resist from giving direct answers.
It is against the code of conduct and does not help anyone.
This site has a policy for "Give Help, Not Answers"
Violations of such policies could potentially result in an account suspension or ban.
Plus it discourages other inspirational teachers to teach properly since the provision of the answer before the solution, makes the questioner to skip the solution part.
It will be very helpful to the questioner and even the openstudy community that you try to walk them through the solution and explain them.
For reference visit
http://openstudy.com/code-of-conduct

Answer 3

ok