10. Explain how to find the equation of a tangent line to a curve at a point. 11. Given a Profit function, P, in terms of number of units, x, explain how Calculus techniques can be used to determine what price will maximize profit. 12. Use implicit differentiation to find dy/dx for the equation y> + y? 4y x? = 5. 13. Explain why a \"+C\" 1s necessary when determining the Antiderivative of a function. Describe how the exact value of \"C\" can be obtained