Students can explain and apply mathematical concepts and interpret and carry out mathematical procedures with precision and fluency to understand the concept of a function, use function notation, and interpret functions in terms of the context. In Target K, tasks will require students to distinguish between relationships that represent functions and those that do not, including recognizing a sequence as a function. Other tasks will require students to identify the domain and range of a function, often in the context of problems associated with Claims 2-4. In Target L, tasks will require students to sketch graphs based on given key features and to interpret key features of graphs, with emphasis on interpreting the average rate of change over a specified interval. Interpretation of rate of change and other key features (intercepts, relative maximums and minimums, symmetries, and end behavior) will often be assessed in the context of problems associated with Claims 2-4.