book Maths Puzzle Numerical Ability

Evaluate the series if it converges.
9 + 27/4 + 81/16 + 243/64

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book Other Question

If I bought a bicycle that cost $385.89..and I paid 7% sales tax..What will the total amount paid for the bike be? How do I solve the following compound inequality and write a solution set using interval notation?

0 < 5 � 2x 10 and -6 < 4 � x < 0

Thank you.