Cell phone charges: One cell phone plan charges a flat monthly rate of $39.95 with extra charges of $0.10 per text message after the first 100 text messages.
a. Choose letters to represent the variables.
b. Write a formula to express the cell phone charges as a function of the number of text messages (assume that the number is at least 100).
c. Use functional notation to show the cost of the cell phone if you have 450 text messages. Use the formula from part b to calculate the cost.
d. Write a formula to express the cell phone charges, this time assuming that the number of text messages is less than 100.
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