What is HL?

HL =

(in the attachment)

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Adifferent website gives the cost for the first train as £56.88 and the second train as £20.11 with a £9.50 charge for cycle storage for the whole trip. how much would the journey cost you?