The answer to this question would be the second option. It’s not happyness but it is happiness. :)
Y = 8.50h
h is for number of hours, can be changed to different letter if preferred
Not really, If you use the Pythagorean theorem on all problems related to distance.. You won't always be able to solve it. It depends on the numbers.
So, false.
76.2cm : 30in is the answer I think