Piecewise and Composition of Function

A house painter charges $12 per hour for the first 40 hours he works, $18 for the ten hours after that, and $24 for all hours after that.

How much does he earn for a 70 hour week?

• $1020

• $1140

• $840

• He works for free!

Which graph matches:

-x+4 if x<2

2x-6 if x>=2

• A

• B

• C

• D

• A
• B
• C
• D

• $12.75
• $35
• $43.40
• $27.75

If a lawyer charges $120 an hour (or any fraction of an hour), how much is a bill for 3 hours and 20 minutes?

• $420
• $480
• $400
• $360

• $12.75
• $35
• $45
• $27.75

Use the graph to evaluate f(9)   {HINT: when x = 9 what does y equal?}

• 0
• 2
• 4
• 6

How much does it cost to rent the Karaoke machine for 3 days?

• $50
• $100
• $150
• $175

How much does it cost to make 300 photocopies?

• $24.00
• $20.00
• $40.00
• $300.00

g(x)=3x+4
h(x)=3x-1
Find (g∘h)(x)

• -9x+11
• 4x²+4x
• 9x+1
• 9x+11