The cost of K-12 education per student was $2200 in 1978 and increased to $10,300 in 2008.

Question:

The cost of K-12 education per student was $2200 in 1978 and increased to $10,300 in 2008. 

(a) Find a formula for a linear function C that models this cost in dollars, where x is years after 1978. 

(b) Estimate when this cost was more than $7600.

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