exam Maths Puzzle Numerical Ability

3=2/5(n+7)

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I am having trouble with this one. Anyone out there that can help me. Thanks!

The half-life of radioactive carbon-14 is 5,700 years. How much initial sample will remain after 3,000 years.

Thanks! A lease calls for a rental of $1000 the first month and an increase of 10% each month over the previous month's rate. How much will it cost to lease this property for six months?