# Interpreting function notation in context

Interpret statements that use function notation in terms of the quantities represented (F-IF.A.2).

In this section, students apply and extend their understanding of function notation in various contexts by interpreting statements that use function notation in terms of the quantities represented.

WHAT: This task asks students to interpret four statements about a function $f$, where $f(t)$ is the number of people, in millions, who own cell phones $t$ years after 1990. The four parts of the task progress in abstraction from $f(10) = 100.3$ to $n = f(t).$
WHAT: This task asks students to explain in everyday language four statements that involve a function $f$, where $f(t)$ is the temperature of the yam $t$ minutes after it’s placed in the oven: $f(0) = 65$; $f(5) < f(10)$; $f(40) = f(45)$; $f(45) > f(60).$