options: Build new functions from existing functions.

Prove and apply trigonometric identities.

Construct and compare linear and exponential models and solve problems.

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

Use functions to model relationships between quantities.

Understand the concept of a function and use function notation.

Analyze functions using different representations.

Model periodic phenomena with trigonometric functions.

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

Define, evaluate, and compare functions.

Build a function that models a relationship between two quantities.

Extend the domain of trigonometric functions using the unit circle.
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