Evaluating Functions Lesson

Evaluating Functions

To EVALUATE a Function is to: Replace (substitute) its variable with a given number or expression

Key Words

• Evaluate: to determine the value of something

• Function: a relation in which each element of the domain is mapped to (paired with) exactly one element of the range

• Input: the value that is transformed by a process and becomes an output

• Output: The result of an input that has been transformed by a process

Multiple Choice

f(x)=4x+5

f(4)=

Rember to "plug" 4 into the "x" value in the equation and solve

f(4)=4(4)+5

• 21

• -11

• -31

• 25

Multiple Choice

The function c(m) = 1.45m + 3.50 represents the cost of a taxi for m miles.
What does c(7) represent?

• A cost of $7 to ride the taxi
• The cost to ride 7 miles
• The minimum distance to ride a taxi
• The minimum cost of a taxi

Multiple Choice

Evaluate f(x)=-2x+13   for f(10)

(Plug 10 into the "x". Don't forget the -2)

• -7
• 1
• -8
• 7

Fill in the Blanks

A train conductor determined the distance in miles a high speed train was from its destination using $d\left(x\right)=1375-110x$   where $x$   is the number of hours traveled. How far is the train from its destination after $8$   hours?

(Plug 8 into the "x" value)