what i thought; see below.
we do not know density if i where to use that formula on the image file .
and i a m wondering why i was given the Reynolds number .
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So the formula you need is Density = P /(R*T) and the value of R you have been given is for air.
Once you have re-worked your answer then you should calculate the Reynolds number and then you can check your result here : Drag on a sphere by NASA