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A. Julie gets a prepaid cell phone. Initially she has a $40.00 balance on the phone. Each minute of talking cost $0.15Find the value of x that makes f(x)=0, and explain its meaning in terms of the cell phone.

User Cutch
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Answer:

Given that,

Julie gets a prepaid cell phone. Initially she has a $40.00 balance on the phone.

Each minute of talking cost $0.15.

To find the value of x that makes f(x)=0.

Let x be the number of munites of talking.

we know that each minute of talking cost $0.15,

we get the equation as,


f(x)=40-0.15x

To find the value of x when f(x)=0,

Substitute f(x)=0, we get


40-0.15x=0
0.15x=40


x=(40)/(0.15)


x=266.67

Answer is: x=266.67

It means that with $40.00 balance, Julie can speak upto 266.67 minutes.

User Vinh Nguyen
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