I don’t understand radicals :/ pls help :)

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?

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base