book Maths Puzzle Numerical Ability

Simplify:

x^2-x-12/x^-16

/ indicates fraction

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book Other Question

A chemist wants to mix a 75% acid solution with a 35% acid solution to produxe 400 ml of a 50% acid solution. How many ml of each solution should he use? Could someone show me how to do this problem? Thank you. Show that for s (semiperimeter), r(radius of inscribed circle), and r 9radius of circumscribed circle), abc = 4srR.