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1. Able industries bought a fax machine for $250. It is expected to depreciate at a rate of 25% per year. What will be the value of the fax machine in 3 years.

2. for a certain strain of bacteria, k is 0.872 when t is measured in days. Using the formula y= ae^kt, how long will it take 9 bacteria to increase to 738 bacteria?

3. Radium-226 has a half- life of 1800 years. Find the constant k in the decay formula for this compound

Solve all of these using exponential growth and decay.

 

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