Calculus - The orange market is perfectly competitive ,and the demand and supply functions?

... are:Q(d) =200-2PQ(S)=-10+Pwhere P is price dollars and Q is the quantity kilograms or:... are:Q(d) =200-2PQ(S)=-10+Pwhere P is price dollars and

... are:
Q(d) =200-2P
Q(S)=-10+P
where P is price dollars and Q is the quantity kilograms

or:... are:Q(d) =200-2PQ(S)=-10+Pwhere P is price dollars and Q is the quantity kilograms

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