A note on cell phones, tardies, and grades

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A note on cell phones, tardies, and grades
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Pre-Calc

• Goal Model real-world situations withy linear
  functions

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Definitions

• Function a relationship between quantities
• Constant function a function that is always the
  same value
• y3, y-2, etc
• Domain the values that can be put into the
  equation (input)
• Range the values that can come out of an
  equation (output)
• Mathematical Model A function that represents a
  real situation

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Example

• Senior class paid 200 to rent a roller-skating
  rink for a fundraising party. Tickets were 5
  each.
• Express the income as a function of number of
  tickets sold
• When does that class make a profit?

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Homework

• 22 (1, 3, 15, 16, 18)