2.06 (Distinguishing functions: Practice)

2.08 (Domain in Context)

Multiple Select

Do Now: What is a Real Number and what is an Integers?

Select all that apply

• Real Number: Positive or negative, large or small, whole numbers or decimal numbers

• Real Number: Only Positive numbers, large or small, whole numbers or decimal numbers

• Integers: A number with no fractional part (no decimals).

• Integers: Only positive numbers with no fractional part (no decimals).

Real Numbers

The type of number we normally use, such as 1, 15.82, −0.1, 3/4, etc.

Positive or negative, large or small, whole numbers or decimal numbers are all Real Numbers.

They are called "Real Numbers" because they are not Imaginary Numbers.

Integers

Includes:

• the counting numbers {1, 2, 3, ...},

• zero {0},

• and the negative of the counting numbers {-1, -2, -3, ...}

We can write them all down like this: {..., -3, -2, -1, 0, 1, 2, 3, ...}

Examples of integers: -16, -3, 0, 1, 198

Domain in Context

Part 1: Which number type is more appropriate for the domain of T(a)?

A) Integers

B) Real numbers

Part 2: What's the appropriate domain?