Please help!! 30 points! A discount sports store has been open for 17 years. For this time period, the store’s annual revenue, R (in millions of dollars), can be modeled by the function
(picture) where t represents the number of years since the store opened. Determine the number of years the store was in business when the revenue amount reached $8.2 million.

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  10 years

Step-by-step explanation:

We want to find the value of t when R = 8.2. Equivalently, we want to find t when ...

  0.001(-t^3 +16t^2 +900t -1400) -8.2 = 0

A graphing calculator is useful for finding real solutions to this equation. The attachment shows the store was in business 10 years when revenue reached 8.2 million.

the least common denominator is 40

b i think

step-by-step explanation:

not really sure