exam Maths Puzzle Numerical Ability

to divide monomials and simplify expressions with negative exponents

(9ab^-2)^-2/(8a^-2b)^-2*(3a^-2b)^3/(2a^2b^-2)^3

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exam Other Question

three-fourths of seven less than a number is forty-two. Find the number If ship is anchored at origin of 3 dim. coordinate sys. and 2 probes are sent below the surface, 1st probe stops at (-8, -4, 6) and 2nd probe stops at
(4, -9, -2) which probe is farather from the ship?