Answer:
Below in bold.
Explanation:
1974: x = 0.
1984: x = 1984-1974 = 10.
2004: x = 2004 - 1974 = 30.
Ticket prices for 1974 = $1.89,
1984 = 1.89 + 10*0.13 = $3.19.
2004 = 1.89 + 30*0.13 = $5.79.
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