$\"\"$

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Number of years from 1980 to 1990: $\"\"$ .

\

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Ticket price $\"\"$

\

$\"\"$ (Substitute y = 10)

\

$\"\"$ (Evaluate power: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

\

$\"\"$ (Divide: $\"\"$ )

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$\"\"$ (Commutative property: a + b = b + a) \ \

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$\"\"$ (Add: 0.4 + 2.4 + 2.62 = 5.42)

\

$\"\"$ (Subtract: $\"\"$ )

\

The average price of a ticket in 1990 is 4.42$. $\"\"$

\

Number of years from 1980 to 2000: $\"\"$ .

\

Ticket price $\"\"$

\

$\"\"$ (Substitute y = 20)

\

$\"\"$ (Evaluate power: $\"\"$ )

\

$\"\"$ (Multiply: $\"\"$ )

\

$\"\"$ (Divide: $\"\"$ )

\

$\"\"$ (Commutative property: a + b = b + a) \ \

\

$\"\"$ (Add: 3.2 + 4.8 + 2.62 = 10.62)

\

$\"\"$ (Subtract: $\"\"$ )

\

The average price of a ticket in 2000 is 6.62$. $\"\"$

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Number of years from 1980 to 2010: $\"\"$

\

Ticket price $\"\"$

\

$\"\"$ (Substitute y = 30)

\

$\"\"$ (Evaluate power: $\"\"$ )

\

$\"\"$ (Multiply: $\"\"$ )

\

$\"\"$ (Divide: $\"\"$ )

\

$\"\"$ (Commutative property: a + b = b + a) \ \

\

$\"\"$ (Add: 10.8 + 7.2 + 2.62 = 20.62)

\

$\"\"$ (Subtract: $\"\"$ )

\

\

The average price of a ticket in 2010 is 11.62$. $\"\"$

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The average price of a ticket in 1990 is 4.42$.

\

The average price of a ticket in 2000 is 6.62$.

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The average price of a ticket in 2010 is 11.62$.