exam Maths Puzzle Numerical Ability

Please help solve the following:

(6^3)(6^-4)

My thoughts are:
1. (666)X (-6-6-6*-6) = 72 x 372 = 26784

2. = 6^-12

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exam Other Question

Please help me understand this word problem. How could I solve this.
Find the dimensions of a right triangle if the shortest side is 3 less than the middle one and 6 less than the hypotenuse. according to the additoin property of equations, each side of an equation may have__________________.