The function f(x) = 40sin(0.1x + 12) + 50 represents the number of items, f(x), made in a factory each day for x days. The data used to generate the function was collected over 90 days.
Graph the model, and then use the graph to determine on which day each event occurred.
The first day production exceeds 70 items is day
The last day in the first cycle that production exceeds 70 items is day
.