3-1 Evaluating Functions

f(x)=4x+5
f(4)=

• 21
• -11
• -31
• 25

f(x)=x+3

f(-5) = ?

• -2

• -1

• -8

• 7

f(x)=x²-5x
f(4)=

• -4
• 126
• 24
• 84

Evaluate f(x) = x² for f(-8)

• 64
• -64
• -16
• 16

Evaluate f(t)=-2t²+ 1 for f(-3)

• 19
  
• 37
• -17
• -11

Evaluate f(x)= 2x² + 5x - 17 for f(-1)

• -20

• -10

• -24

• -14

Evaluate f(6).

• f(6) = 18

• f(6) = 12

• f(6) = 10

• f(6) = 1

For what value of x does f(x) = -2?

• x = 0

• x = -5

• x = 3

• x = -3

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

Ms. Brackemyer is collecting pencils.  The function p(x)=5x+12 tells us the total amount of pencils Ms. Brackemyer has after collecting for x number of days.  What is the meaning of p(8)=52?

• Ms. Brackemyer starts with 8 pencils and ends with 52.
• After 8 days, Ms. Brackemyer has 52 pencils.
• Ms. Brackemyer starts with 52 pencils and gets 4 more every day.
• Every day, Ms. Brackemyer gets 4 new pencils until she has 52.