Unit Plan
University of North Carolina

University of North Carolina Wilmington: Graphs of Functions

For Students 9th - 10th
Defining the graph of a function, vertical line test, characteristics of graphs, approximating relative extrema, and even and odd functions are covered with examples that include charts and graphs.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Bf Rainfall

For Teachers 9th - 10th Standards
In this task, students are asked to analyze a function and its inverse when the function is given as a table of values. In addition to finding values of the inverse function from the table, they also have to explain why the given...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F if Graphing Rational Functions

For Teachers 9th - 10th Standards
In this task, students interact with a Desmos app by moving sliders and making observations about features of the graphs and the structures of the expressions of the functions. Aligns with F-IF.C.7.d.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Bf Graphs of Compositions

For Teachers 9th - 10th Standards
This task addresses an important issue about inverse functions. In this case, the function f is the inverse of the function g but g is not the inverse of f unless the domain of f is restricted. Aligns with F-BF.A.1.c.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf Trigonometric Functions for Arbitrary Angles

For Teachers 9th - 10th Standards
The purpose of this task is to examine trigonometric functions for obtuse angles. Aligns with F-TF.A.2.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F if the Parking Lot

For Teachers 9th - 10th Standards
In this task about parking lot rates, students investigate what a function is and explain their reasoning. Aligns with F-IF.A.1.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F If.3 Snake on a Plane

For Teachers 9th - 10th Standards
In a video game called Snake, a player moves a snake through a square region in the plane, trying to eat the white pellets that appear. This task has learners approach a function via both a recursive and an algebraic definition, in the...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Bf Temperatures in Degrees Fahrenheit and Celsius

For Teachers 9th - 10th
In this task involving temperature conversions, students construct a linear function given two input-output pairs, investigate the inverse of a linear function, and reason about quantities and/or solving a linear equation. Aligns with...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf Foxes and Rabbits 2

For Teachers 9th - 10th
Students are presented with a table that shows the populations of foxes and rabbits in a national park over a 12-month period. This is the second Foxes and Rabbits task. In this problem, students must find trigonometric functions that...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf, F if as the Wheel Turns

For Teachers 9th - 10th Standards
In this task, students use trigonometric functions to model the movement of a point around a wheel and through space. Students also interpret features of graphs in terms of the given real-world context. Aligns with F-TF.B.5 and F-IF.B.4.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le a Valuable Quarter

For Teachers 9th - 10th
The context of this task is that a quarter was put into a bank account in 1901 and students are asked to calculate its value in 2013 at two different interest rates. Those amounts are compared to the appreciation rate of a rare and...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le Us Population 1790 1860

For Teachers 9th - 10th Standards
In this task, learners are shown a table of U.S. population data between 1790 and 1860 and are asked to explore whether exponential functions would be appropriate to model relationships within the data. The purpose of the task is to help...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le Equal Differences Over Equal Intervals 1

For Teachers 9th - 10th Standards
In this task, students prove that linear functions grow by equal differences over equal intervals, and notice that in this case, the equal differences have the same value as the slope. Aligns with F-LE.A.1.a.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le Algae Blooms

For Teachers 9th - 10th Standards
This problem examines the growth of algal blooms in Chesapeake Bay. Students build an exponential function modeling algae concentration based on the information provided, and gain an appreciation for the exponential growth exhibited...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le Do Two Points Determine a Linear Function Ii?

For Teachers 9th - 10th Standards
In this task, students investigate the relationship between linear equations and linear functions. Aligns with F-LE.A.2.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le Boiling Water

For Teachers 9th - 10th
Students are shown two tables of data showing the approximate boiling point of water at different elevations. Both data sets can be modeled by linear functions but with different slopes. When the tables are combined, however, students...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le Comparing Exponentials

For Teachers 9th - 10th Standards
In this task, students work with exponential functions in a real-world context involving continuously compounded interest. They will study how the base of the exponential function impacts its growth rate and use logarithms to solve...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F if Throwing Baseballs

For Teachers 9th - 10th Standards
In this task about the height of baseballs thrown into the air, students are asked to compare characteristics of two quadratic functions that are each represented differently, one as the graph of a quadratic function and one written out...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: A Apr Zeroes and Factorization of Quadratic Polynomial

For Teachers 9th - 10th Standards
This is the first of a series of problems building to an understanding of an important property of polynomial functions, that a polynomial of degree d can have at most d roots. Aligns with A-APR.B.2.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.f Foxes and Rabbits

For Teachers 8th Standards
In this problem about the predator-prey relationship between the fox and rabbit populations, 8th graders are asked to identify and explain any functions that they see. Aligns with 8.F.A.1.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Bf Identifying Even and Odd Functions

For Teachers 9th - 10th Standards
In this task, students are presented with four functions and must determine whether each is odd, even, or neither. Includes a GeoGebra worksheet that can be used by the instructor to demonstrate the material. Aligns with F-BF.B.3.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: 8.f Modeling With a Linear Function

For Teachers 8th Standards
In this task, 8th graders are presented with the equation for a linear function and asked to identify which of six problem situations the equation could represent. Aligns with 8.F.B.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf, G Co, Trigonometric Identities and Rigid Motions

For Teachers 9th - 10th Standards
The purpose of this task is to apply translations and reflections to the graphs of the functions f(x)=cos x and g(x)=sin x in order to derive some trigonometric identities. There are also rotations 180 degrees about points on the x-axis...
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Le Choosing an Appropriate Growth Model

For Teachers 9th - 10th Standards
The goal of this task is to examine some population data for large cities from a modeling perspective. Students are asked to decide if the population data can be accurately modeled by a linear, quadratic, and/or exponential function, and...