WILL GIVE BRANLIEST PLS HELP ASAP TYSM! In this Activity, you will formulate and graph exponential and logarithmic functions and describe the relationship between the two functions. Oak wilt is a fungal disease that affects oak trees. they determined that they can use this exponential model to predict the number of trees in the forest that would be infected After t years. f ( t ) = e^0.4t

Part A: Graph the function f ( t ) e^0.4t

Part B: The scientists believe the forest will be seriously damaged when 21 or more of the forests's 200 oak trees are infected by oat wilt. According to their model, how many years will it take for 21 of the trees to become infected?
It will take approximately _ years for 21 of the tree to become infected.