exam Maths Puzzle Numerical Ability Geometry

please help

simplify

(3x^-2y)(2x^-3y^-2)

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exam Other Question

When x number of units are sold, the price of each unit (in
dollars) is given by P=-x/2+75. Find the unit price when the following quantities
are sold: 2, 7, 9, 11.
18. Determine which two equations represent perpendicular lines.
(a) y = x - 3
(b) y = 5x -
(c) y = x +
(d) y = x


A) (a) and (b)
B) (b) and (c)
C) (a) and (d