What is 15 out of 100 in simplest form

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?

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)