book Maths Puzzle Numerical Ability

I was wondering if you could simplify this problem any more. 5 radical 6 minus 5 all over 5. Please e-mail back a simplified answer ASAP. thank you!
I was also wondering if there are two consecutive even interegers whose sum is 84. Thank You also!

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book Other Question

The cost of a taxi ride is calculated by adding a fixed amount to a charge for each 1/4 mile of the trip. If a one mile trip costs $4.00 and 1 and 1/2 mile trip cost $5.50 , what will be the costs of a 3 mile trip? If P(4, -5) is a point on the graph of the function y = f(x), find the corresponding point on the graph of y = 2f(x-6).

Thanks.