Round-trip airline tickets to Hawaii are regularly $800, but for each additional ticket purchased the price is

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Round-trip airline tickets to Hawaii are regularly $800, but for each additional ticket purchased the price is reduced by $5. For example, I ticket costs $800, 2 tickets cost 2(795) = $1590, and 3 tickets cost 3(790) = $2370. 

(a) Write a quadratic function C that gives the total cost of purchasing / tickets. 

(b) Solve C(t) = 17,000 and interpret the result. 

(c) Find the absolute maximum for C and interpret your result. Assume that I must be an integer.

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