exam Maths Puzzle Numerical Ability

simplify

m^x/4*n^3

Divided by

m^2x/3(n^a)^3

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exam Other Question

6 - |4x - 3| = -19

how do i solve the following absolute value?? I am completely stuck; please help me. Thank you!

Mike invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate?