How Can You Use Function Notation to Represent a Function

How would you write y = 2x - 3 in function notation?

• y = 2x-3

• f = 2x - 3

• f(x) = 2x-3

If I know that f(2) = 4, what is another way I can write my answer?

• 2,4

• (2, 4)

• That is the only way to write it.

f(x) is the same thing as ______.

• y

• x

• input

• an equation

If a question asks you to find f(2), what does that mean?

• Let x = 2

• Let y = 2

Function R gives the amount of snow measured by a snow gauge h hours since it started snowing. The amount of snow is measured in centimeters. Use function notation to represent this situation. 5 hours after it started snowing the amount of snow was 11 cm.

• R(5) = 11

• R(11) = 5

• t(11) = 5

• t(5) =11

Your grade in algebra class is a function of how many proficient scores you earn. This function is represented by g(x), where x represents the number of proficient scores and g(x) represents your grade percentage. Explain what g(16) = 85 means in context.

• A grade of 16 means there were 85 proficient

• If I earn 16 proficient scores then my grade will be an 85%

• g is 5.3

• If I earn 85 proficients I will get a 16%

The function h(t) represents the height in inches of a plant after t weeks. What does the notation h(4) = 5 mean?

• After 5 weeks the plant is 4 inches tall.

• The plant grows at a rate of 5/4 inches per week.

• After 4 weeks the plant is 5 inches tall.

• The plant grows at a rate of 1 inch per week.

Function f gives the temperature, in degrees Celsius, t hours after midnight. Choose the equation that represents the statement "At 1:30 p.m., the temperature was 20 degrees Celsius". Hint: use military time!

• f(1:30)=20

• f(1.5)=20

• f(13:30)=20

• f(13.5)=20

Decide whether or not Diego or Andre have a higher name value.

• Diego

• Andre

Function f gives the temperature, in degrees Celsius, t hours after midnight.

Use function notation to write an equation or expression for the following statement.

It was warmer at 9 a.m. than at 6 a.m.

• f(9) = f(6)

• f(9) < f(6)

• f(9) > f(6)

• f(6) = 9