In 2011, the mean salary of public school teachers was $56,643, and it increased by about $1199

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In 2011, the mean salary of public school teachers was $56,643, and it increased by about $1199 per year until 2014. Let s be the mean salary (in dollars) at t years since 2011.
a. Find an equation of a model.
b. Estimate the mean salary in 2014.
c. Estimate when the mean salary was $59,041.
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