Expontential Growth word problem

Question

A culture of cells is increasing according to the law of exponential growth. In the beginning, there were 150 cells. A scientist records that after 5 hours, there are 600 cells. Approximately how many cells will there be after 10 hours?

Answer 1

600 = 150e^5k

4 = e^5k

e^10k = (e^5k)²

e^10k = 4²

After 10 hours there are 16 times 150 cells.