Is It a Function Algebra

Which of the following is NOT a function?

• <(0,1), (1,2), (2,3), (3,4)>

• <(0,2), (1,3), (4,3), (1,2)>

• <(1,3), (4,2), (2,0), (3,4)>

• <(1,2), (2,2), (3,2), (4,2)>

Evaluate f(10) when f(x)=2x+1

• f(10) = 3

• f(10) = 10

• f(10) = 21

• f(10) = 30

Is this a function?

• Yes, one output for each input

• No, look at the -3's

• It depends

• Not enough information

Is the following relation a function: (2, 3) (4, 5) (5, 3)

• yes because one output for each input

• no because 3 appears twice as an output

• not enough information

• it depends

Is the following relation a function: (2, 3) (2, 4) (5, 10)

• yes because one input for each output

• no because 2 appears twice as an input with different outputs

• not enough information

• it depends

Is the following relation a function: (2, 3) (5, 10) (2, 3)

• yes because there is one output for each input

• no because 2 appears twice as an input

• not enough information

• it depends

What does the f in "f(x)" usually stand for?

• function

• fraction

• factor

• ****

What always goes inside the parentheses in "f(x)"?

• the output

• the input

• the y-value

• the answer

Evaluate f(2) when f(x) = x+3

• f(2) = 2

• f(2) = 3

• f(2) = 5

• f(2) = 6

Evaluate g(5) when g(x)=2x

• g(5) = 2

• g(5) = 5

• g(5) = 7

• g(5) = 10