For 1998 through 2005, the sales S (in billions of dollars) of sporting goods can be modeled by S = 0.007³ + 0.1t² + 1.4x + 70

Question

For 1998 through 2005, the sales S (in billions of dollars) of sporting goods can be modeled by 
S = 0.007³ + 0.1t² + 1.4x + 70 
where t is the number of years since 1998. In which year were sales about $78 billion?

Kunduz · Accepted Answer

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