Attached you will find a file with the answers, including the graph and the table of data.
I used Excel to plot the graph. First you have to create the table of data.
To create the table use:
- a column for the days from 1 to more than 365 (enough to include several years), pass the days to years (dividing by 365)
- in the next column, calculate the function: P(t) =4000 + 500sin(2πt - π/2)