Final answer:
The marginal demand when P=2 is equal to 12.
Step-by-step explanation:
The demand function is given by D=3P^(2)+7. To find the marginal demand when P=2, we need to find the derivative of the demand function and evaluate it at P=2.
- Take the derivative of the demand function: dD/dP = 6P.
- Substitute P=2 into the derivative: dD/dP = 6(2) = 12.
Therefore, the marginal demand when P=2 is 12.