Evaluating functions

The  exercise appears under the 8th Grade Math Mission. This exercise gives understanding of how functions work as input-output machines.

Types of Problems
There are two types of problems in this exercise:


 * 1) Find the value from the graph: This problem provides a graph and asks the student to find the output for a particular input for the graphed function.Ufn1.png
 * 2) Find the value from the rule: This problem provides a rule for calculating a function. The student is asked to find the output for a particular input.Ufn2.png

Strategies
Knowledge of function notations and the various forms of functions are an advantage when trying to complete this exercise.
 * 1) A function can be represented in many forms, but the most important idea is that is an assignment of an output to an input. This fact can help to read graphs and follow function rules.

Real-life applications

 * 1) These types of problems can show up on SATs and other standardized tests.
 * 2) Models, often represented by functions, are developed in many business and science fields. Being able to understand the purpose of a model helps to use them efficiently and accurately.