Question

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

Answer 1

Answer:

• See below

Step-by-step 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

Answer 2

Answer:

• 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: $\frac{40-100}{4-2}$ : $\frac{-60}{2}$ : $-30$%/hr

{ observation from the graph given }