book Maths Puzzle Numerical Ability

I'm trying to answer a question and that is what are the similarities between radical and rational exponent notation. I know they both use the same properties...but I feel like I'm

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FORMULA FOR CALCULATING PERCNTAGE DIFFERENCES OF 1 AMOUNT TO ANOTHER.
SUCH AS $6.00IS WHAT PERCENTAGE OF $5.80? A fisherman takes his boat out to sea and then back to the harbor. The entire trip lasts 8 hours. If he travels out at 18 mph and follows the same route back at 14 mph, how many miles does he travel altogether?