options: Model periodic phenomena with trigonometric functions.

Understand the concept of a function and use function notation.

Prove and apply trigonometric identities.

Interpret functions that arise in applications in terms of the context.

Construct and compare linear and exponential models and solve problems.

Define, evaluate, and compare functions.

Use functions to model relationships between quantities.

Build new functions from existing functions.

Interpret expressions for functions in terms of the situation they model.

Analyze functions using different representations.

Extend the domain of trigonometric functions using the unit circle.

Build a function that models a relationship between two quantities.
problem_activity: Task
California is in the fifth year of a drought. Towns have been asked to decrease water use across the state. The graph below shows the water storage in Lake Sonoma, a reservoir in Northern California from 1988, shortly after it was first filled, until February 1, 2015.
What questions do you have looking at the graph?
Describe some of the features of the graph.
What might explain these features?  (Consider data collection, weather events and reservoir management decisions.)
Based on the given information, should the region that depends on Lake Sonoma for water use implement additional water conservation measures?
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correct_option_index: 3