Unit 5 Lessons 6,7,8,9

Below are graphs of the value of two cell phones over time. Which phone is more expensive to buy on the release date?

• Phone A
• Phone B
• Both phones cost the same on release.
• This question is legitimately impossible to answer.

Below are graphs of the value of two cell phones over time. Which phone drops more in value in its first year?

• Phone A
• Phone B
• Both phones decrease the same amount in value.
• This question is legitimately impossible to answer.

Below are graphs of the value of two cell phones over time. What is the value of Phone A when it is two years old?

• 600
• 360
• 472.5
• 630

Below are graphs of the value of two cell phones over time. A = 1000 * (1/3)^t, B = 840 * (3/4)^t.

• A(4) = 115
• B(4) = 354.38
• A(4) = 360
• A(4) = 129.6

How long does it take for the value of this thing to be at or below $100?

• 2 years
• 4 years
• 5 years
• 8 years

Natasha says that the value is decreasing by exactly half (so V(x) = 1200 * (1/2)^t). Is that correct?

• Yes
• No
• yes, but it doesn't start out at $1200
• i don't care