The video tutorial explains the importance of functions using a relatable candy store example. It distinguishes between relations and functions, emphasizing that functions have a rule assigning each input exactly one output. The tutorial provides examples of both functions and non-functions, illustrating how predictability is a key feature of functions. By the end, viewers understand how to identify functions and apply function rules to predict outcomes.

Why was the cashier's action at the candy store incorrect?

• The cashier followed the rule of the function.

• The cashier charged different prices for the same input.

• The cashier used a function to determine the price.

• The cashier charged too little for the candy bars.

What is a relation in mathematical terms?

• A set of numbers with no specific order.

• A function with multiple outputs for each input.

• A pairing of numbers that may or may not follow a rule.

• A pairing of numbers that always follows a rule.

How is a function different from a general relation?

• A function assigns multiple outputs to each input.

• A function assigns exactly one output to each input.

• A function is a random pairing of numbers.

• A function does not follow any rule.

In the candy bar example, what is the output when the input is two bars?

• 1 dollar

• 75 cents

• 1 dollar fifty

• 3 dollars fifty

Why is the multiplication facts test not considered a function?

• Because it is a predictable relation.

• Because it follows a strict rule.

• Because it has different outputs for the same input.

• Because it has the same output for different inputs.

What question can you ask to determine if a relation is a function?

• Can I predict the input from the output?

• Does each input have multiple outputs?

• Can I predict the output from the input?

• Is the relation random?

What does the phrase 'exactly one output' signify in the context of functions?

• Each input is assigned to exactly one output.

• Inputs are not related to outputs.

• Each input can have multiple outputs.

• Outputs are unpredictable.

What is the result of input times 3 in the given example?

• A random pairing

• A function with multiple outputs

• A non-function relation

• A function with a unique output

What happens when you square the input in the second mathematical example?

• It becomes a non-function.

• It results in multiple outputs.

• It becomes a function with a unique output.

• It becomes unpredictable.

What is the key takeaway from the lesson on functions?

• Functions have multiple outputs for each input.

• Functions are unpredictable.

• Functions assign exactly one output to each input.

• Functions do not follow any rules.