book Maths Puzzle Numerical Ability

It took Terry 7 hours to drive the 390 km from Cold Bay to Morgan's Cove. He averaged 60 km/h for the first part of the trip, but was forced to complete the trip at 50 km/h due to

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I just can't figure out what they are asking .Its very hard
1.sqrt x^2 =x an identity (true for all values of x)?

2.A.
x-sqrt x=0 Solve for all values of x that satisfies the please tell me how to do pythagorean triples

(17,8,5) is this a pythagorean triple? why or why not