please help me I can't do this math.

Tiana is planning to participate in an event at her school's field day that requires her to complete tasks at various stations in the fastest time possible. To prepare for the event, she is practicing and keeping track her time to complete each station.

Part A : I already did part A

Part B : Create a function to represent the data. f(x) = Evaluate f(x) when x = 5. f(5)= Exponential function formula_f(x) = ab* 3.05

A.5
B.4
C.3
D.2
E.1
F.x

Part C : Determine the average rate of change between day 2 and day 4. Show your work. Rate of change formula = Y/₂=Y₁ X₂-X₁​