Motorists often complain about rising gas prices. Some motorists purchase fuel-efficient vehicles and participate in trip reduction plans, such as carpooling and using alternative transportation. Other drivers try to drive only when necessary.

Answer the following questions. Make sure to show your work.

Imagine you are at agas station filling your tank with gas. The function C(g) represents the cost C of filling up the gas tank with g gallons. Given the equation

What does the number 3.03 represent?

Find C(2).

Find C(9).

For the average motorist, name one value for g that would be inappropriate for this functionâ€™s purpose. Explain why you chose thatnumber.

If you were to graph C(g), what would be an appropriate domain andrange? Explain your reasoning.

Examine the rise in gasoline prices from 1997 to 2006. The price of regular unleaded gasoline in January 1997 was $1.26, and in January 2006, the price of regular unleaded gasoline was $2.31 (â€œConsumer price index,â€ 2006). Use the coordinates (1997, 1.26) and (2006, 2.31) to find the slope, or rate of change, between the two points. Describe how you arrived at your answer.

The linear equation

represents an estimate of the average cost of gas for year x starting in 1997(â€œConsumer price index,â€ 2006). The year 1997 would be represented by x =1, for example,becauseit is the first year in the study. Similarly, 2005 would be year 9, or x = 9.

Whatyear would be represented by x = 4?

What x-value represents the year 2018?

What is the slope, or rate of change, of this equation?

What is the y-intercept?

What does the y-intercept represent?

Assumingthis growth trend continues, what will the price of gasoline be in the year 2018? How did you arrive at your answer?

The line

represents an estimate of the average cost of gasoline each year. The line

estimates the price of gasoline in January of each year (â€œConsumer price index,â€ 2006).

Do you expect the lines to be intersecting, parallel, or perpendicular? Explain your reasoning.

Use the equations of the lines to determine if they are parallel. What did you find?

Did your answer to Part b. confirm your expectation in Part a?

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