A function is one-to-one (injective) if:

• A. Each input has only one output.

• B. Different inputs have different outputs.

• C. Every output has at least one input.

• D. Inputs can have the same output.

A function is onto (surjective) if:

• Every element in the codomain has an input from the domain.

• Every input has an output.

• Every output is greater than zero.

• The domain and codomain are the same.

A bijective function is one that is:

• One-to-one only

• Onto only

• Both one-to-one and onto

• Neither one-to-one nor onto

A function that gives each student in a class a unique seat number is:

• One-to-one

• Onto

• Bijective

• Neither

A function that assigns each student their favorite subject is:

• One-to-one

• Onto

• Bijective

• Neither

A vending machine gives a different snack for each button, and each snack has one button.

• One-to-one

• Onto

• Bijective

• Neither

A teacher assigns each student one locker, and each locker has one student.

• One-to-one only

• Onto only

• Bijective

• Neither

A function that gives each person their birth month is:

• One-to-one

• Onto

• Bijective

• Neither

A function that matches student ID number to a student is:

• One-to-one

• Onto

• Bijective

A function that assigns a color to each ball in a box (some balls have the same color) is:

• One-to-one

• Onto

• Bijective

• Neither