I have stuck on the question below for 3 days so I really need someone to help me out.

(The number of hours needed to cook a turkey that weights x lb can be approximated by

t(x)=0.90x^(3/5)

where t(x) is the time in hours and x is the weight of the turkey in pounds.Find the weight of a turkey that cooked for 4hr. )

I tried it out but it looks weird to me.

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