Answer:
look at the picture i have sent
Answer:
f(-2) = 2
Step-by-step explanation:
The question is asking you to find the y value when the x value is -2. When observing the graph, we can see when the x value is -2, the y value is 2. Therefore, f(-2) = 2.
Answer:
a)
, b) 
Step-by-step explanation:
a) The rate of change of the brightness of the Cepheid can be determined by deriving the function in time:


b) The rate of increase after one day is:

