Mrs. Tuttle gives money to each of her grandchildren on their birthday. She gave her grandson, Clyde, $14 when he turned 2. She gave her granddaughter, Ella, $30 when she turned 10. She gave her grandson, Peter, $12 on his first birthday. She gave her grandson, Michael, $24 when he turned 7. What is the best method for finding how much she would give to her granddaughter, Tina, on her fifth birthday?

Step-by-step explanation:

The given values of money can be plotted against age. They fall on a straight line with a slope of 2 and a y-intercept of 10.

Evaluating that relationship for an age of 5, we have ...

  money = 10 + 2(5) = 20

We expect Mrs. Tuttle to give Tina $20 on her 5th birthday.

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Note that each vertical square on the graph represents $2, and each horizontal square represents 1/2 year. So, the slope is ...

  rise/run = (1 vertical square)/(2 horizontal squares)

  = $2/(2·1/2 year)

  = $2 per year

step-by-step explanation: