Can you please help me with these questions

Revenue is the gross amount brought in by sales. So if we subtract the costs, we get the net amount, which is the profit. Therefore, if monthly revenue is R(x) = -0.45x^2 + 160x + 412, and monthly cost is C(x) = 205x + 300, then profit P(x):
P(x) = R(x) - C(x) = -0.45x^2 + (160x - 205x) + (412 - 300)
P(x) = -0.45x^2 - 45x + 112
This fits the choices (-0.45, -45, 112)