exam Maths Puzzle Numerical Ability

Please can you help me in this question because am having alot of problem...
there it says complete the table of values for y=x-2-4x

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Add. Simplify, if possible.

t+x/tx^2 + 4t+x/t^2x I am having difficulty setting up this word problem. If a taxi charges .50 for the first 1/5 of a mile, and .20 for every 1/10 of a mile after that, how much would it cost to go 2 miles?