Answer:
After 25 days will be present about 13.70 ≅ 13 bacteria
Explanation:
The form of the exponential function is y = a
, where
∵ A certain bacteria multiply exponentially at a rate of 8% per day
→ Assume that y is the number of bacteria, x is the number of days
∴ r = 8% =
= 0.08
∵ 2 bacteria exist initially
∴ a = 2
→ Substitute them in the form of the equation above
∵ y = 2

∴ y = 2

∵ x = 25
→ Substitute x in the equation by 25
∴ y = 2

∴ y = 13.69695
∴ After 25 days will be present about 13.70 bacteria
Note: The number of bacteria must be the whole number so the answer should be 13 bacteria will be present after 25 days.