Question: I keep getting 32 ft/per sec. but it's wrong, where am I messing up Use the definition to find an expression for the instantaneous velocity

I keep getting 32 ft/per sec. but it's wrong, where am I messing up

Use the definition to find an expression for the instantaneous velocity of an object moving with rectilinear motion according to the given function relating s (in ft) and t (in s). Then calculate the instantaneous velocity for the given value of t. S = 412 - 2t; t= 4 The expression for the instantaneous velocity of the object is] 4

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