compound interest

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How do I solve these problems?

Complete the table for a savings account in which interest is compounded continuously.

1. Initial Investment: $1000
Annual % Rate: 3.5%
Time to Double: ?
Amount After 10 Years: ?

2. Initial Investment: $750
Annual % Rate: ?
Time to Double: 7 3/4 yr
Amount After 10 Years?

3. Initial Investment: $500
Annual % Rate: ?
Time to Double: ?
Amount After 10 Years: $1505.00

4. Initial Investment: ?
Annual % Rate: 4.5%
Time to Double: ?
Amount After 10 Years: $10,000.00

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