exam Maths Puzzle Numerical Ability

Solve for m: 2<-6(m +1)<10

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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? A sequence in which the ratio of successive terms is a constant r, called the common ratio is a(n) ____________ sequence.