Question

Lin uses an app to graph the charge on her phone.

When did she start using her phone?

When did she start charging her phone?

While she was using her phone, at what rate was Lin’s phone battery dying?

Answer 1

• she start using her phone at 2 hours after noon

• she start charging her phone at 8 hours after noon.

• rate when Lin’s phone battery dying:
  `(40-100)/(4-2)` :
  `(-60)/(2)` :
  `-30`%/hr

{ observation from the graph given }

Answer 2

• See below

Explanation:

Use the graph to answer the following questions:

When did she start using her phone?

• At 2 afternoon

When did she start charging her phone?

• At 8 afternoon

While she was using her phone, at what rate was Lin’s phone battery dying?

From 100% to 40% between 2PM and 4 PM:

• (100 - 40)/(4 - 2) = 60/2 = 30% per hour