Place the four smiles in order from the least value of a to the greatest value of a. Drag and drop each smile to its appropriate place.

View the animation below to see parabolas in a famous marketing symbol. Click on the words "famous landmark" to start the animation, and then use the animation to answer the questions that follow.

• In what direction do the parabolas in the "Golden Arches" symbol appear to open?

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  Check Your Answer

  The parabolas open downward.

• If you were to write an equation representing each parabola in the "Golden Arches," would the value of a be positive or negative? How do you know?

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  Check Your Answer

  The value of a would be negative because the parabolas open downward.

• Are the vertices for each parabola in the "Golden Arches" maximum values or minimum values? How do you know?

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  Check Your Answer

  The vertices are maximum values because all other y-values in each parabola would be less than the vertex at the top of the arch.