Question: please help Phi} = -x3 +iFr2 - 6(1):: + 100, x a 5 is an approximation to the total prot [in thousands of dollars] from

please help

Phi} = -x3 +iFr2 - 6(1):: + 100, x a 5 is an approximation to the total prot [in thousands of dollars] from the sale of x hundred thousand tires. Find the number of tires that must he sold to maximize prot. A] 550000 B) 450,000 C} 500,000 D) 400,000

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