exam Maths Puzzle Numerical Ability

How do I write 243 in exponential notation

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exam Other Question

Hi, ive been asked to answer the following questions, and having great difficulty, i have managed to answer the first question, (although with ALOT of help), but i was wondering if one person proofreads a copy for a small newspaper in 4 hours. If a second proofreader is also emplyoed, the job can be done in 2.5 hours. how long does it take for the 2nd proofreader to do the job alone.