Title: Cell phone Algebra
1Cell phone Algebra
http//www.youtube.com/v/NOY9bg3kUAw?fs1amphle
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2Questions from video
- Does anyone know of someone who has gotten in
trouble for having an outrageous cell phone bill? - How do cell companies charge you for overages?
- What are the different types of cell phone plans?
3- Ruth enjoys texting a lot. Perhaps too much.
She pays 39.99 per month for cell phone service
plus 0.12 per text.
About how much will she be charged for 1,2,3,4,5
text message? For 1000 texts? For 5000 texts?
For 10,000 texts? Write an expression for any
number of text messages she will make.
4Problem
Graph
Ruth enjoys texting a lot. Perhaps too much. She
pays 39.99 per month for cell phone service plus
0.12 per text.
Table
Rule
x Process y
1
2
3
4
5
100
1000
5000
10000
5- Alicia pays 99.99 per month with unlimited
text messages.
About how much will she be charged for 1,2,3,4,5
text message? For 1000 texts? For 5000 texts?
For 10,000 texts? Write an expression for any
number of text messages she will make.
6Problem
Graph
Alicia pays 99.99 per month with unlimited text
messages.
Table
Rule
x Process y
1
2
3
4
5
100
1000
5000
10000
7- Claudia also enjoys texting a lot. Perhaps too
much. She pays 65.00 per month for cell phone
service plus 0.05 per text message.
How much will she be charged for 1,2,3,4,5 text
message? For 1000 texts? For 5000 texts? For
10,000 texts? Write an expression for any number
of text messages she will make.
8 Problem
Graph
Claudia pays 55.00 per month for cell phone
service plus 0.05 per text
Table
Rule
x Process y
1
2
3
4
5
100
1000
5000
10000
9- Nona has no idea how much she pays for text
messaging. Her cell phone bill varied each month
due to her erratic text messaging. She knows she
pays 45.00 per month and extra for each text
message. About how much does she pay for each
text? - Here are her monthly bills
January 85 500 texts February 125 1000
texts March 165 1500 texts April 205 2000
texts May 245 2500 texts
10Problem
Graph
Nona knows she pays 45.00 per month and extra
for each text message.
January 85 500 texts February 125 1000
texts March 165 1500 texts April 205 2000
texts May 245 2500 texts
Table
Rule
x Process y
0 45
85
125
205
245
280
325
11- Whose plan has the better deal?
- After how many text messages is this plan a
better deal? - What method did you use to determine this
information? - Use another method to prove you are correct.