book Maths Puzzle Numerical Ability

Divide the rational expressions. Simplify the result.

(48x^2/y) / (36xy^2/5)

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Hi My problem is this:

2[3/(19-4^2)] solve.
you have to show each step.
also when you show each step you have to show
the property and i dont understand properties that mu can i have the formula of this "area of a trapezoid given its baes1,base2 ane height"